H. L. Scientific Industries
Bank Road, Ambala, Haryana
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Physics Research Instruments

We are manufacture, Supplier & Exporter a wide range of Physics Research Instruments like Viscosity Apparatus capillary flow, Clement & Disormies Apparatus, Boy's law Apparatus Torsion Apparatus, Davy Safety Lamp, Milli Ammeter D/C Moving Coil, Digital Panel Meter, Fly Wheel, Maxwell Needle, Lee & Charlton Apparatus, Suction Pump, Screw Gauge,Young,s Modulus,Spectrometer, Galvanometers, Jager's Apparatus, Vernier callipers, Speherometers,Potentiometers,Meter Bridges, Induction Coil, Tuning Fork, Electrical Tuning Fork,Pulleys, Bucket Cylinder,Parllogram of Force apparatus,Force Table, Gold Leaf Electroscope,Hook's law apparatus,Two & Four Stroke Petrol & Diesel Engine Models,Linear Expansion Apparatus,Ring & Ball, Inclined Plane,Barometers,Hope's Apparatus,Thermals Conductivity Apparatus,Copper Calorimeters,Steam Generator,Ticket Tape Timer,Bimetallic strip,Rain Gauge, Anemometer Cup Type,Rising Table, Expansion Apparatus,Bar Pendulum, Viscometer Searle,s Pattern,Platinum Resistance Thermometer,Bending Of Beam, Barton's Apparatus, Copper Voltameter,Dip Circle, Tangent galvanometer, Banana & Crocodile Plug,Earth Inductor,Drawing Board,Ballistic galvanometer, Spot Reflecting Galvanometer, Plug Keys, Tapping Keys,Reversing Keys, Lamp & Scale, Millicon's Oil Drop Apparatus,Magnetic Compass, Vibration Magnatometer, Deflection magnatometer,Model og Daynamo, Model of Telephone Set,Newton Ring, Pendulum Bob, Metal Cubes, Metal Cylinder,Possion Ratio of Rubber Apparatus, Bell Demonstration Model, Optical Bench Set, Bi-Prism & Fresenal Bi-Prism Assembly, Research Optical Bench, Rehostate, Post Office Box, Resistance Box,Decade Resistance Box,Condenser Box,Slotted weights, Analitical weight Box, Physical weight Box, Chemical weight Box,Van de graff Generator,Cylinderical/Conical/Sphere Conductor,Solonide, Ebonite Rod, Carbon Rod, Copper Rod, Zinc Rod, Magnets,Crooks radiometer,Biots Apparatus, Daniel Cell, Leclanchee Cell, Simple Cell, Porus Pots, Zinc & Copper Plate, Test Tube Holders etc.

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Description:

Panel mounted, spin free with 4 mm. sockets. Available in Black/Red colours

Different types of Sockets, Plugs are shown in the picture. 


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  • Item Code: HL-1302
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'PHYSILAB' Brass Veriner Calliper
These Testing Equipment, Vernier Caliper are made of brass with dual scale in mm and inches available in different sizes.
1.       BVC  65mm/2.5inch
2.       BVC  75mm/3.0inch
3.       BVC 100mm/4.0inch.

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  • Item Code: HL-41166
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Babinet Compensator Offering Babinet Compensator., The Instrument consists of two round scales. One with index and the other with vernier. The first scale (Index scale) is for turning the analyzer into the azimuth. The second scale (vernier scale ) is for measuring the degree of orientation of a wedge box. The long wedge is moveable by means of a micrometer drum with the help of which accurate reading of the movement is taken.


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  • Item Code: HL-1298
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With 2 plastic plates dia 30cms, each carries aluminium foil segment. Maximum spark length 75mm. The neutralising bars are provided. The collecting brushes are carried on a large insulating beam. A pair of high capacity leyden jars are incorporated wKPHh may be connected or disconnected as required. The complete apparatus is mounted on a wooden base with rubber feet.
Dimensions 450x175x500mm length x width x height.

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  • Item Code: HL-1282
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Laboratory spectrometer offered by us are extensively demanded in the market due to its robust structure that includes telescope & collimator that have fine rack & pinion motion and are mounted on a stable heavy C. I. base with three leveling screws. Customers are eased with the availability of the Student Spectrometer in Brass and Stainless Steel Scale in both the sizes of 15.0 cm (6") and 17.5 cm (7") of protected circle. Moreover, we are listed at the apex in the list of the preeminent Scientific Spectrometer Suppliers in India.

 

 

Spectrometer

Collimator:-Its purpose is to produce parallel beam of light. It is fitted with special quality of 175mm F.L. achromatic object glass and of wide clear aperture. It is fitted with rack & pinion focusing.

 

Slit:- It is fixed to the Collimator tube end and is of stainless steel. It has two sharp edges, which are optically true, one edge is fixed while other moves parallel to it.

 

Telescope:- It is an astronomical telescope fitted with an achromatic objective of highest quality and clear aperture. It is mounted on another are which is fixed rigidly to the circular scale of the spectrometer. The telescope along with the scale can be turned round a vertical axis passing through the centre of the spectrometer.

 

Prism Table:- It has an upper plate and lower plate separated by three springs through which it pass three leveling screws. A series

of concentric circle with the  axis of rotation of the prism as its centre, are engraved on the prism table along with two lines at right angles passing through the centre of the prism table.

 

Base:- The sturdy base with heavy casting along with two level screws gives the instrument stability and horizontal leveling.

 

Model Available:-

  1. 6” Spectrometer with venire constant with 1 minute or 30 second are, 10x Ramsden eye piece finest optics fully achromatic 7” focal length aperture 1”.
  2. 7” Spectrometer has protected circle of 7”. As per requirement provided with two venires of 1 minute or 30 seconds. Finest optics fully achromatic 7” focal length, aperture 1”. Scale graduation is 1/2º or 1º range 360 º, and venire constant 30 seconds, 10x Ramsden eye piece cross line graticule (glass) Magnifiers.
  3. Advanced Research Spectrometer:-Research Spectrometer 9” circle and 2 venire scale, graduated gunmetal 9” scale divided into 1/3 º divisions, accuracy of calibration ± 0.0001%, two opposite venires to read upto 20 seconds. Finest optics 9” focal length and 1 dia meter 10x Gauss eye piece. 

 

Optional Accessories:-

  1. Diffraction Grating 
  2. Sodium Vapour Lamp, Transformer  Sodium Lamp Wooden Box. 
  3. Magnifiers 4”
  4. Prism

 


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  • Item Code: HL-1293
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Research optical bench 
(physilab research optical bench model)
The bed is heavy cast iron with a strong control rib, throughly seasoned and aged before machining and griding of its upper surfaces. Total length 170cm. With a machined full length platform for the scale. The scale is from lifetime stainless steel fitted on its machined platform on the bed,divided in mms to a length of 170cm. Accuracy of calibration 0. 01%
Lythe type 170cm long with accessories, assembly 4 riders slit.


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  • Item Code: HL-1151
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For accurate measurement of the radius of curvature of spherical lenses. Three pronged brass table with three pointed legs carries a vertical main scale from 10-0-10 mm on one of the prongs, and a micrometer scale on an brass disc with 100 divions. The table has a screw at its centre with a pitch of 1mm. Giving a least count of .01mm.
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  • Item Code: HL-1021
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Young's Searle's Pattern. Sprit Level mounted in two rectangular cast iron frame with one end resting on point of micrometer screw,fitted in one frame, the second end of sprit level pivoted in the second frame. The micrometer is provided with vertical scale 10 mm, on either sides  of the zero and vernier reading 0.01 mm. complete with ceiling  bracket having  two self centering chucks  and tension  weight. supplied in case.

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  • Item Code: HL-1013
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The segment of brass metal are mounted on a bakelite base. The multi brush sweeping contacts move over the either segment with a handle.
A) Plug Key
B) Rocking
C) Phol's Commutator
D) Double Pole Double Through

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  • Item Code: HL-1122
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A steel frame mounted on a heavy cast iron base with leveling screws. Upper end of rod (under test) 900mm length and 5mm dia is clamped by a 3-jaw chuck and the lower end is clamped into the axis of a torsional drum which can be rotated by putting load in the scale pan passing over two frictionless pulley. Freely sliding three circular scales graduated in single degrees can be clamped at any position. Three pointer for clamping to the test rod are provided. Complete with three test rods, strings and two scale pans, but without weight.
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  • Item Code: HL-1087
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Jamin interferometer .

for determination of change in refractive index in liquid and gases of the order of 10-6  

instrument is provided with compensating plates for working with monochromatic

and white light source.

essential accessories:

a.        plane-parallel optical glass cell with mechanical mounts.

b.       a pair of gas cell with plane-parallel widows with mechanical mount.

c.        telescope to observe the fringes.

d.       stethoscope to measure the pressure difference while looking at the shift of

      number of  fringes with respect to change in pressure of the gas column

     optional accessories:

     a.    sodium vapor lamp(35w) with choke and enclosure.
      b. Table lamp.      

 

 


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  • Item Code: HL-1299
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The Ultrasonic energy is produced by converting electrical energy in to Mechanical Vibrations by using generator and piezo Electric Transducers. Due to Mechanical Vibrations in cleaning liquid this Phenomenon is called cavitation. In a very short time it removes all dirt & foreign bodies from components which are immersed in the cleaning liquid.

  • Continuous Self Tuning Circuitry For Any change In Workload, Liquid Level And Bath Temp
  • Uniform Cavitations Through Out The Tank
  • Separate Oscillator Eliminates Damage To Generator In Case of Failure Of Transducers
  • Using 40 Khz Frequency For Effective Cleaning With Low Noise
  • Designed For Complete Cleaning Of Small and Large Components Without Dismantling

 

Tank Volume (Litres)

1.8L

2.5 L

4L

6 L

9 L

12 L

Ultrasonic Wattage

50 W

50 W

100 W

150 W

200 W

200 W

Ultrasonic Frequency

40±3 KHz

Tank Dimension ( Taper) LxWxH (mm)

150x137x

100

150x137x

150

235x135x

150

300x153x

150

300x240x150

300x240x

150

Outer Dimension LxWxH(mm)

175x165x

200

175x165x

250

265x165x

290

325x175x

290

325x265x

290

325x265

x340

Heating

Ambient to 80°C Digitally Controlled (Dual Display)

Digital Timer

5 to 60 minutes

Tank Drain

N/A

Ball Valve

Inner Tank Material

Stainless Steel

Outer Housing Material

Stainless Steel

Power Supply

220Volt, Ac 50 Hz, Single Phase




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  • Item Code: HL-1306
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Of stainless steel chromium plated, with 3 pans, one of wkphh with shorter stirrup and with hook. Pans adjustable height with downward playing pointer. The balance is mounted on a rectangular wooden polished base. Capacity 250g sensitivity 10mg.
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  • Item Code: HL-1174
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To find the co-efficient of viscosity of water by nothingits flow through a capillary tube of uniform bore. A capillary tube of fine bore is fitted on a wooden board. Then two ends are joined by rubber tubing and it joints to two uprights glass L-shaped tubes forming the manometer with scale. With the help of a pinch cock, a steady flow of water is maintained. Complete with a three limbed constant level tank of brass on stand with rubber tube glass parts are made of corning glass.
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  • Item Code: HL-1001
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For determining the ratio of the specific heats of a gas.Glass bottle of about 10 liters capacity which is fitted in a wooden box.The neck of the bottle is fitted with a metal cap.The cap is fitted with a bent tube with stop-cock for connection to a pump which is fitted to the side of the wooden box. A stop cock for opening to air and a bend for connection to the manometer is provided.
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  • Item Code: HL-1002
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Boy's law apparatus

It has two glass tubes, one closed at the top and other tube open whose lower ends are connected together by 1 meter of rubber tubing.Both tubes are mounted on sliding brackets with a provision to lock at any point.Metallic strip with a meter scale graduated from 0 to 100cm fitted on heavy iron base with leveling screws without mercury provided with pressure rubber tube.


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  • Item Code: HL-1003
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About 20cm. in dia and 45mm. wide turned and carefully balanced, mounted on a horizontal shaft, held in ball bearings.The wheel is marked and pointer is fixed to the bracket.The bracket has four holes and can be fixed to the wall.
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  • Item Code: HL-1008
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All brass N.P. for experiments on rigidity.it consists of a hallow brass tube graduated with scale divided in mms and wih vernier to read 0.05mm. 40cms. long, 18mm, dia fitted with a small chuk and carrying a mirror, 2 solid cylinders and 2 hollow cyllinders all 10cms long accurately fitted in the bore of the tube and ceilling attachment with chuck.
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  • Item Code: HL-1009
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Lee & charlton's for determination of the thermal conductivity of bad conductor. Cylinderical metal slab nickel-plated 110mm. Diameter, 12mm thick, on this resets a steam chest made of brass nickel-plated 50mm height same diameter fitted with riffled inlet and outlet tubes. Both are having radial holes for insertion of thermometers. Apparatus is suspended by strings attached to lower slab on retort stand with rectangular metal base. Complete with one each disc specimens of glass and ebonite annulus for determining the conductivity of liquids. Without thermometers.
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  • Item Code: HL-1010
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Made of nickle plated brass, with ratchet top, accurately machined stainless steel rod, range 0-25x0.001mm.,Supplied in plastic case.
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  • Item Code: HL-1012
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Vernier caliper: The vernier caliper we offer are made of steel in one side graduated in inches from 0 to 5 and other in centimeters from 0 to 12 with depth gauge, inside and outside measurement jaws. Types of vernier caliper: • Without wheel motion polished • With wheel motion polished • Without wheel motion chrome plated • With wheel motion chrome plated

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  • Item Code: HL-1022
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Potentiometer 10 wire laminated board with boss side sun mice pencil jockey with brass fitting with connecting lead.
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  • Item Code: HL-1023
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Comprising a seasoned wood resonance box 45"x4"x4" with meter scales one meter long sub-divided in millimeters. One each brass and steel wires of S.W.G. 26 and 24 respectively, attached to a fixed bridge and tensioned by fine adjustment pegs; two moveable bridges, pulley and fixed screw to enable a third wire to be fixed for tensioning by weights.
 


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  • Item Code: HL-1025
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IME type, improved design plated steel with dual scale 0-15cm.x0.1mm and 6x1/128inches, provided with thumb movement for easy motion of jaws, in velvet lined box/plastic case.
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  • Item Code: HL-1026
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Consists of 16 pieces, contains various geometrical models and figures.Made of hard wood and supplied in wooden box.

24/1 size 40mmx25mm
24/2 size 50mmx30mm

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  • Item Code: HL-1029
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Comprising a 50mm. diameter pulley, carried on a two part aluminium frame, designed primarily for clamping to the edge of a bench, table etc. With the pulley overhanging the edge and in a vertical plane. Overall length of frame(pulley bar) 110mm. Maximum clamp opening 25mm.
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  • Item Code: HL-1035
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To verify the relationship between forces action at a point. Comprises board 65x50cm, with two aluminium pulleys 50mm. dia.,on clamp, for mounting in any position. Complete with three hangers iron nickel plated 50gm. and 12 slotted weights of 50gms. each.
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  • Item Code: HL-1037
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Represents internal structure and operating principles of an air-cooled two-stroke engine. All parts in aluminium alloy.Ignition is shown by means of a miniature bulb. Carburetter and fuel supply also sectioned. Mounted on metal base.
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  • Item Code: HL-1045
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An apparatus for demonstrating thermal expansion, comprising a captive brass ball secured to a mounted brass ring by a chain. Ring mounted on rod with a wooden handle.The ball passes through the ring when cold but will not pass through after being heated. Ball dia. 25mm.
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  • Item Code: HL-1047
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For measuring of relative humidity in air 0-100x 1% r.h. In metal case.
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  • Item Code: HL-1051
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For demonstration, mercury column is feasible and scale graduated in metric and english system. Zero point adjustment is carried by a screw clamp attached to a glass tube, complete fitted on wooden polished, supplied without mercury.
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  • Item Code: HL-1053
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A superior standard mercury barometer suitable for altitudes upto 600 meters. The barometer has a nominal bore of 7mm. Graduated scales covering 675 to 810mm. Hg and 26 to 32inch Hg. The scale of are screw fastened to metal frame at the top of the tube. A vernier reading 0.05mm Hg. and 0.002inch Hg. Provided with an adjustment knob is mounted between the two scales. The reservoir has a standard type of adjustment screw and index and the barometer fitted with -10 to 50deg. C thermometer mounted on a polished base. Complete with working instructions.
Fortin's Barometer Mercury for use with above Wooden case for above.

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  • Item Code: HL-1054
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For use on pump plate not less than 15cm. dia. Electric Bell operating 4-6Volts AC/DC, suspended on rubber cord in bell jar. Fine coiled wire connections to terminals mounted in rubber bung sealing the jar.

Sizes: 9"x6" and 8"x4"

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  • Item Code: HL-1056
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Metal rods 150x3mm.(length x dia.), one each of aluminium, brass, copper, glass and iron, embedded along one side of a metal tank size 150x90x100mm.(length x width x height).
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  • Item Code: HL-1058
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With parallel sides and rolled rim, without stirrer.

Dimensions are in mm.
75x50 diameter             100x75 diameter

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  • Item Code: HL-1060
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A complete set in copper comprising : 1 inner vessel carried on cork supports; 1 outer vessel diameter 1 lid for out vessel with central tubule for thermometer and slit for 1-stirrer.
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  • Item Code: HL-1061
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Polished Copper, 75x50mm. diameter resting on felt pad inside an outer vessel, 100x75mm. diameter. Outer vessel fitted with detachable cliptype thermometer support. Complete with stirrer.
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  • Item Code: HL-1063
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Copper, 75x50mm., height x diameter, resting on felt pad inside wooden polished box, which is provided with a brass nickle plated thermometer holder, with copper stirrer.
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  • Item Code: HL-1064
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For determination of the specific heat capacity of as liquid by the electrical method. Comprises a nickle-plated copper calorimeter 75x50mm. Lagged and enclosed within an outer vessel 100x75mm. A close fitting ebonite lid is provided with a wire stirrer, and a pair of 4mm. socket terminals connected to a constantan wire heating coil. The resistance of the coil is approximately 6ohms and should be used with a current of 0.5A with a maximumof 1A. supplied without thermometer.
Calorimeter Joule's
Thermometer 50x0.10C, extra for above

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  • Item Code: HL-1067
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Constructed from copper. It has funnel, an inner receiving vessel and an outer body all of copper, and a glass measuring cylinder.
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  • Item Code: HL-1074
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The apparatus comprise metal frame, on which four capillary tubes of 10cm. long and of different internal diameters are clamped with the help of small metal brackets. The 9mm. rod is also attached to metal plate, so that complete clamp can be held in any stand for determining the surface tension of liquid by capillary rise method. Its having a cast aluminium 4" dia table with adjustable stand. Maximum height capacity 12".
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  • Item Code: HL-1079
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It is used for measuring viscosity of very viscos liquids.The outer cylinder can be clamped at any desired height and the inner cylinder is graduated in mms and slot is covered by a transparent cover. Complete with scale pans and releasing pin.
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  • Item Code: HL-1080
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Bending of beam apparatus: consisting of two g. Clamp with knife-edge top. Comprising a metal bar of 100 cm length having width 25 mm and thickness 4. 5 mm. Sharp knife edge with hanger is also provided which moves on metal bar. A spherometer fitted on a cast iron stand (specially designed for this apparatus) with electric contacts is also provided, but without weight.  


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  • Item Code: HL-1086
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B     2V 45ah
C     6V GlOBE
D     12VLARGE

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  • Item Code: HL-1091
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Prepared in one or more dials each consisting of ten steps fitted in teak wood polished case. Each dial has 10steps.
a) One dial(any one range)
b) Two dials(any one range)
c) Three dials(any one range)
d) Four dials(any one range)
e) Five dials(any one range)

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  • Item Code: HL-1092
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The case is made of aluminium, strongly mangetised cobalt steel needle fitted with imported hard axle rolls on knife edges agates and can be clamped when desired by a V clamp, a sensitive spirit level is provided. The tripod stand is provided with three levelling screws.

 

College type:- Dip circle availabel in brass and aluminium.

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  • Item Code: HL-1096
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Superior quality made of soft wood:
a) 12"x18" Thick Board
b) 16"x23" Thick Board

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  • Item Code: HL-1097
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a) One way
b) Two way
c) Three way
d) Four way

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  • Item Code: HL-1110
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For comparing the densities of liquids by measuring the heights of the two columns of liquid produced by applying suction to the short center limb. Comprising a three-limbed glass tube, with 250mm of rubber tubing on the centre limb, mounted on a stand with a scale 61cm long with the zero at the bottom. Overall dimensions 680x305x150mm.
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  • Item Code: HL-1118
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Brass strip(Nickle Plated) with insulated knob and terminals mounted on a bakelite plate of high insulation.
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  • Item Code: HL-1123
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Consisting of a cycle rubber tube 1/2m long fitted with a small pointer at one lowest end and at upper end cork with a hole is fitted with clamp.
A) Full meter scale
B) Extra superior Heavy Stand Full meter tube

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  • Item Code: HL-1143
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It consists of two metallic rods (one rod is engraved in mMS) supported by heavy cast iron feet, provided with 4 metal riders.
A) 4riders, 2 Slow Motions, Lens Holders, pins.
B) -do- Superior quality.
C) -do- Both rods covered with brass graduated pipes.
D) -do- 150CM Long 0-128 A-Type
E) -do- 150CM both rod covered with brass pipe.
F) -do- Both S.S. Rod.

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  • Item Code: HL-1150
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Made of cast iron, hammertone paint finish, with large hole in the centre and small slot designed to prevent masses sliding of hanger. Accuracy ± 5%.
Capacity in gms.
A 50
B 100
C 200
D 500

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  • Item Code: HL-1159
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Masses set iron
Hexagonal shape finished in hammertone paint, with lifting rings
a 50
b 100
c 200
d 500
e 1000
f 2000
g 5000

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  • Item Code: HL-1160
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Very superior quality, Brass chrome plate weights with rider & fractional weights set in velvet lined nicely polished wooden case.
Specifications
Set 200gms. : 1x200g, 1x100g, 1x50g, 1x20g, 1x10g, 1x5g, 2x2g, 1x1g.
Set of ten weights : 1x500g, 1x200g, 1x100g, 2x20g, 1x10g, 1x5g, 2x2g, 1x1g.

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  • Item Code: HL-1165
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Made of chrome plated brass & weights are accurately machined.
Set consists of 1x100g, 1x50g, 2x20g, 1x10g, 1x5g, 2xg, 1x1g and fractional weights from 1mg to 500mg. Kept in wooden box with forceps.

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  • Item Code: HL-1166
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made of chrome plated brass with accuracy ±5%.  
  no. Of slotted masses mass in gms. mass of wire hanger in gms. total mass in gms.
a 9 10 10 100
b 9 20 20 200
c 9 50 50 500
d 9 100 100 1000

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  • Item Code: HL-1167
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For density determinations, set of twelve in assorted sizes, shapes and masses. The set comprises two each of brass, iron, aluminium, copper, zinc and lead. Masses vary from 12 to 25g approx.
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  • Item Code: HL-1169
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A variety of materials in form of rectangular blocks, intended to familiarise the student with the appearance. ‘feel’ texture, hardness and density of a range of common substances. Kit comprises two each of seventeen blocks as detailed below.
blocks, 50 x 40 x 30mm
softwood, hardwood, paraffin wax, aluminium, iron, foamed polystyrene.
blocks, 20 x 20 x 100mm
perspex, glass, slate, aluminium, softwood, marble.

blocks, other sizes
lead 50 x 50 x 20mm, aluminium 50 x 50 x 80mm, hardwood 50 x 50 x 200mm, brass 20 x 20 x 50mm, iron 40 x 40 x 20mm pack.


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  • Item Code: HL-1170
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Borosilicate glass cylinder with overflow spout.
Dimension: 120 x 65mm approx.

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  • Item Code: HL-1173
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Made of brass nickel plated 125 x 50mm length x dia in size, mounted on insulated metal stand with base.  
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  • Item Code: HL-1178
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Made of brass nickel plated, 100mm x 50mm length x dia in size mounted on insulated metal stand with base.  
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  • Item Code: HL-1179
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Made of brass, nickel plated, mounted on insulated stand with base, with an opening 5cms dia at top.  
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  • Item Code: HL-1180
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A plastic disc 16cms dia in wooden base, a brass nickel plated 100mm dia plate with ebonite handle and a small brass contact sphere.
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  • Item Code: HL-1181
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for producing positive charges relative to polythene when rubbed by a woollen rubber.
dimensions : 250x25x1. 5mm length x width x tkphkness.  

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  • Item Code: HL-1182
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Dimensions: 300x12. 5mm length x dia.  
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  • Item Code: HL-1184
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A cycle dynamo mounted on a wooden base 200x115x12mm. And provided with two sets of gears driven by a hand crank for fast or slow rotation. Two 4mm socket terminals are provided for dynamo output, connected in parallel with an m. E. S. Lamp holder and 2. 5 v. Bulb.

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  • Item Code: HL-1188
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A helical coil 310mm long of DCC copper wire mounted on a wooden board, number of turns marked with 1 metre connecting cable, fuses, push switch compass and soft iron rod 350x10mm, internal dia of coil 25mm for use on 230v main supply.

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  • Item Code: HL-1190
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for demonstrating the formation of a basic major chord. Comprises four forks mounted on a common box and having frequencies of c 256hz, e 320hz, g 384hz and c 512hz. When sounding together, therefore, the forks produce the chord of c major.
dimensions of resonance box : 285x115x63mm lxwxh

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  • Item Code: HL-1195
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An accurately balanced magnetic needle, strongly magnetised is fitted with hardened steel pivot working in jewels cup bearing. The needle can be easily removed for reversal. The inclination scale is of chrome brass graduated in degrees 0-90 four times. The case is made of nonmagnetic cast alloy, duco painted, has easily removable plate glass window and rotates fully on heavy brass base, its rotation being measured by a brass chrome dial 0-360°. It is fitted with levelling screw and spirit level.

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  • Item Code: HL-1197
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Set of 8 tuning fork of nickel plated steel with plain or screwed shank in case, frequencies marked from (C1 256) to (C2 512) as above.
Additional Information:
  • Item Code: HL-1201
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Magnetic needle with stand
For magnetic needle, with plastic base 72mm dia and 6mm dia aluminium pillar supporting a steel needle pivot. Overall height of stand 100mm approx.

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  • Item Code: HL-1206
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Consisting of a glass tube heavy walled 1350x32mm length x i. D. With cork bung, short and long ebonite rod, cork pistons, mounted on a polished wooden board 1520x125x22mm l x w x d with spring clamps. The long ebonite piston supported by wood clamp secured with wing nuts.
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  • Item Code: HL-1208
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For melde’s and other experiments. A steel rod is clamped near one end through two 4mm terminals. The rod passes through a small solenoid and between the poles of a magnet. Adjustable contact points fitted through a second pair of terminals make alternating connection with an adjustable contact on the rod. The rod has a small hole at one end for the attachment of thread wkphh passes over a bench mounting pulley and supports a scale pan. For 2v a. C. Supplies. With pulley and clamp, scale pan and instructions.
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  • Item Code: HL-1210
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Set of 8 of blue steel, plain shank, one each of c(256) d, e, f, g, a, b, c (512) in velvet lined box.

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  • Item Code: HL-1211
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Chrome plated with frequency marked, a set of 13 of different frequency from 256c to 512c, packed in velvet lined box.
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  • Item Code: HL-1212
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Made of steel, 12mm dia in pairs, half red and half blue (for n and s) spray painted, with keepers.
 size in mm
a50
b75
c100

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  • Item Code: HL-1215
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made of cobalt steel, 12mm dia, in pairs, half red and half blue (for n and s) spray painted, very strong, with keeper.
  size in mm
a 50
b 75
c 100
d 150

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  • Item Code: HL-1235
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pocket compass
in metal case 43mm dia marked with points of the compass and degrees with cover.

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  • Item Code: HL-1220
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 (a) set of 8 forks
 (b) set of 13 forks
made of aluminium alloy rustless

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  • Item Code: HL-1222
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set of three tuning forks, two c 256 and one c 512 mounted on resonance boxes with brass plates drilled and threaded to take the threaded shanks of the forks. The length of each box is carefully adjusted to suit the frequency of the fork and is mounted on cork feet.
tuning fork : c 256
resonance box dimensions : 340x112x47mm l x w x h.
tuning fork : c 512
resonance box dimensions :125x112x47mm l x w x h.

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  • Item Code: HL-1223
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Pair of tuning forks. A (426. 6) mounted on individual resonance boxes. One fork fitted with sliding mass. With hammer.

Additional Information:
  • Item Code: HL-1250
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Consists of a metal tank 150 x 90 x 100mm l x b x h has six apertures on one side through WKPHH 100 x 3mm length x dia metal rods of copper, brass, aluminium, iron, zinc and lead pass. The outer end of each rod has a cavity. When the low melting point paraffin wax is placed in the cavity, the different metals melt the paraffin at different rates.
Additional Information:
  • Item Code: HL-1175
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Construction is same as above but having two bulbs with 2 sets of vane, when exposed to sunlight the vanes rotate in opposite directions.
Additional Information:
  • Item Code: HL-1202
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For the experimental determination of the specific heat capacity of different metals. Cylindrical metal block, mass 1 kg. Adjusted to an accuracy of ± 2%. Each block is drilled with two holes, a large central hole, 12. 5mm diameter, for a special immersion heater and a smaller hole, 7. 5mm diameter, for a thermometer of copper, brass, aluminium & iron.
Additional Information:
  • Item Code: HL-1233
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Good quality one piece spinning, rolled rim, polished finish vessel with wooden/ bakelite lid fitted with rubber stopper and metal stirrer.
  (Ht x Dia) (Ht x Dia)
 (A) Copper 75 x 50 mm 
 (B) Aluminium 75 x 50 mm 
 (C) Copper 100 x 75 mm
 (D) Aluminium 100 x 75 mm

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  • Item Code: HL-1194
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A complete set comprising the following. 1 copper calorimeter 75 x 50mm. 1 wooden outer box with felt lining 100 x 75mm approx. 1 sliding wooden cover for outer box. 1 copper stirrer with loop to fit inside the copper calorimeter. 1 thermometer holder made of brass removable.
Additional Information:
  • Item Code: HL-1225
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Copper calorimeter 75 x 50 mm with felt insulation, outer vessel of 100 x 65 mm size with a plastic lid having holes for thermometer & stirrer. A thermometer holder is fixed to the outer vessel. Complete with stirrer. 
(A) with outer vessel of copper
(B) with outer vessel of aluminium

Additional Information:
  • Item Code: HL-1224
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one piece spinning with parallel sides and rolled rim.
  size in mm
(a) 75x50
(b) 100x75

Additional Information:
  • Item Code: HL-1227
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One piece spinning with parallel sides and rolled rim.
  Size in mm
(A) 75x50
(B) 100X75

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  • Item Code: HL-1246
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Consisting of metal strips of copper, brass, aluminum, iron of 100 x 15mm length x width having small cups at outer ends for holding phosphorous and screwed on a wooden ring 125mm outside dia meeting in the centre.  
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  • Item Code: HL-1236
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For demonstrating the differential expansion of two different metals. One each brass and iron plates 350 x 35mm length x breadth riveted together from end to end with wooden handle.  
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  • Item Code: HL-1204
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For showing the difference in conductivity. Rod 300 x 18mm length x dia ½ of WKPHH is of brass and ½ of polished wood jointed together.
Additional Information:
  • Item Code: HL-1218
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The model demonstrates the principle operation. It is cut way to show the internal constructional details. Unlike other engines the rotary piston engine avoids reciprocating parts. The power piston is an arch like triangular rotor wk phh on rotating generates an epitrochoid. Mounted on base, with printed diagram showing working.
Additional Information:
  • Item Code: HL-1264
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connecting units wKPHh provide the energy to light the lamps and fulfils the requirements of showing the change over switch.The alignment of the pulleys for interconnection of the units with the Drive Belts is assured and therefore provides an efficient performance without the use of 'G' clamps. The Switch is a double pole / double throw knife switch for the connecting the motor - generator energy sources or the Lamp Unit.
The Triple Light Unit comprises 3 MES lamps wKPHh are connected parallel and provides an indication of the energy out puts form the various sources and also indicates the energy requirement to light each individual lamp.
Specification: Switch Double Pole / Double , ThrowLamps 3.5V, 0.25A, MES

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  • Item Code: HL-1270
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Comprising a 6mm steel shaft mounted in brackets with nylon bearings. One end carries an aluminium v pulley 56mm diameter, and the other over hanging end, is fitted with a cord anchoring collar.
Dimensions of laminated wooden base 155 x 105mm.

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  • Item Code: HL-1249
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Three lamp holders are connected in parallel. Supplied complete with three lamps 1. 25 v 0. 25 a m. E. S.
Dimensions of laminated wooden base 155 x 105mm.  

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  • Item Code: HL-1285
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Again a high quality electric motor is used to ensure a long trouble free life. The primary purpose of this unit is to compare the power input and output with the large motor generator.
Specification: drive pulley 12mm , operating voltage 1. 5 to 4. 5v

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  • Item Code: HL-1284
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The driving and output pulleys are both 75mm diameter, and the intermediate pulley is 20mm diameter giving a step-up ratio of 3. 75.
Dimensions of laminated wooden base 155 x 105mm.

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  • Item Code: HL-1283
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comprising a brass cylinder, internal size 27 x 16mm diameter, with and integral v pulley in the base of the cylinder and a 6mm diameter steel shaft wkphh fits into a bearing block. A vertical pillar carries the corklined friction arms and thermometer support. Supplied without thermometer.
dimensions of laminated wooden base 155 x 105mm.  

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  • Item Code: HL-1262
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For demonstration of wave motion, helical coil of flat section tempered steel, coil dia 75 mm closed length 11 cms fully extended 3 meters.
Additional Information:
  • Item Code: HL-1243
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With insulated handles diameter 50mm. Can be used in conjunction with the hollow conductor sphere for showing that an electrostatic charge resides on the outer surface of a conductor (by removing the outer surface and leaving the inner sphere uncharged). Complete with spherical conductor on insulated stand with base.

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  • Item Code: HL-1255
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With insulated handles diameter 50mm. Can be used in conjunction with the hollow conductor sphere for showing that an electrostatic charge resides on the outer surface of a conductor (by removing the outer surface and leaving the inner sphere uncharged). Complete with spherical conductor on insulated stand with base.

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  • Item Code: HL-1247
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A 100ml conical borosilicate glass flask, brass rod with disc and gold leaf attached, supported in cork with polythene insert overall height approx. 125mm.
Additional Information:
  • Item Code: HL-1251
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For leclanche cell 150 x 12. 5 diameter, fitted with a brass terminal.
Additional Information:
  • Item Code: HL-1252
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Comprises a copper vessel 150x100mm height x dia with terminal and perforated shelf, tkphk zinc rod 150x12. 5mm height x dia with brass terminal and porous pot 140x50mm height x dia complete.
Additional Information:
  • Item Code: HL-1268
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for construction of simple cells
dimensions - 150x50x1. 2mm

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  • Item Code: HL-1263
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suitable for making simple cells. Cylindrical with ground edges.
dimensions : 150x100mm height x dia

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  • Item Code: HL-1275
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Simple cell pot, as the name suggests, is used for making simple cell and voltmeters etc. Molded on polypropylene, this pot has very good contact clarity and excellent chemical resistance. Being polypropylene, this pot is much durable than the one used conventionally. Of simple cells
Dimensions : 150 x 100mm height x dia.
Material : polypropylene.

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  • Item Code: HL-1237
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Lead accumulators, storage type 2v/20 ah for steady discharge of currents not exceeding 0. 75 a in polystyrene container with negative and positive marked terminals with charging instructions. Supplied uncharged without acid.

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  • Item Code: HL-1280
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A contact arm and three metal studs mounted on a bakelite base with three brass terminals. The centre terminal is common connection to the arm and the two other terminals are connected to the other studs.
Additional Information:
  • Item Code: HL-1267
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4mm with screw connection for leads, longitudinal and transverse 4mm holes for extra plug connections, hard plastic insulating body.
  colour
f red 
g black
h yellow

Additional Information:
  • Item Code: HL-1271
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4 mm plugs connected by a length of flexible, plastic insulated copper wire. The plugs are stackable.
colour red, black and yellow.
  length
i 300mm
j 500mm
k 1000mm

Additional Information:
  • Item Code: HL-1254
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Zeeman effect is an optomagnetic device in which a source of line spectrum prefavourly monochromatic source is placed between the poles of electromagnet.  On applying the suitable magnetic field, the spectral line splits into sub components which have wavelength different from its main / original wavelength.  The apparatus should have:

·         Constant deviation spectrograph

·         Calibration of drum: 400 nm to 700 nm

·         Least count of calibration: 1 nm

·         Constant deviation prism made of optical glass having refractive
          index – 1.71

·         Electromagnet should have field strength 10 KG at a gap of 10 mm    

          Between its poles

·         Pole pieces dia.: 50 mm; length: 200 mm

·         One end of pole pieces is tapered (tapered dia. 25 mm)

·         Other end is threaded and provided with a mechanism to move pole  
          pieces back & forth to vary the gap between them

·         Digital and stabilized power supply (30 volt; 10 amp) for above    
          electromagnet.

·         Neon discharge tube of suitable capillary thickness

·         Wooden stand for holding the above discharge tube

·         High voltage transformer (Range: 1-4.5 KV) to run the above    
          discharge tube.

·         Digital gauss meter (Range: 2-20 KG)

·         Is required to measure the applied magnetic field

·         A micrometer eyepiece (measuring range: 0-15 mm) should have least
          count 0.01 mm

·         Fabry-Perot etalon (clear aperture 25 mm) should be provided with
          level screws


Additional Information:
  • Item Code: HL-1292
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We are amongst the reputed manufacturers of HL-517 michelson interferometer. These interferometers have lead screw of dia 17 mm, Pitch 1 mm with a threaded length of 200 mm. The lead screw and its nut are optically lapped for maintaining constancy of the pitch. Further, the mirror mounts are of kinematic type that has orthogonal tilt arrangement in x & y plane by using fine threaded screws.

 

Features:


  • Mirror holders (Fitted with mirror mount), which makes them capable of holding mirrors of 25.4 mm dia & 12.5 mm thickness
  • Interferometer provided by 3 scales
  • Linear scale 0-150 mm graduated in mm is attached with bed of interferometer
  • Graduated disc (0-100 Div.) may be peeped through glass window and is provided with head of the Interferometer
  • One division of graduated disc H 0.01 mm
  • A graduated slow motion drum (Graduation 0-100 Div) fitted on right hand side of Interferometer
  • One division of sow drum = 00001 mm. that is least count of Interferometer: 10 'mm

 

Optical Parts:


  • Beam Splitter: (Size: 40 mm x 30 mm x 8 mm), partially coated
  • Coating Mat: Al + Sio2: R/T ratio: 50/50 ± 5%
  • Optical finish: A/10 both faces
  • Parallelism between their faces <5 arc seconds

 

Note: Beam splitter plate (before coating) & compensating plate are carved from same optically worked glass plate having:

 

Specifications:


  • Thickness: 8 mm
  • Surface flatness: A/10
  • Parallelism between two faces: <5 arc seconds to maintain their optical identity
  • Mirror (Front surface coated) Dia: 25 mm, Thickness: 10 mm
  • Surface flatness of coated face: A/10 & other face optically polished
  • Mirrors reflectivity * 90%
  • Telescope Observation The Fringes: Objective is an achromatic doublet of din 25 mm
  • F.L: 125 mm
  • Telescope magnification: 10x

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  • Item Code: HL-517
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Insulated, PVC coated, with 4mm Banana plugs.

Additional Information:
  • Item Code: HL-1304
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Yogesh Goswami(CEO)
No. 175/10, Bank Road, Opposite Power House Mohan Lal Building, 1st Floor
Ambala - 133001
Haryana, India
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