A single pan, low form balance that has three notched beams with center indicating sliding masses giving total weighing capacity of 610g. The capacity can be extended to 2610g with supplementary masses. Spring loaded zero adjust compensator and magnetic damping are provided. Stainless steel pan is of 150mm diameter.

• Beams: 0-500g x 100g
• 0-100g x 10g
• 0-10g x 0.1g
• -01 Set of Supplementary Masses to extend the range of the balance to 2610g capacity.
• -02 Support Rod for under weighing facility.
• -03 Un-calibrated Tare Beam of capacity 200g.

Two pan balance for accurate and rapid weighing up to 2000g when used with supplementary masses. The balance has center indicating sliding masses to weigh up to 210g, spring loaded zero adjust compensator and magnetic damping. Stainless steel pans are of 150mm diameter.

• Beams: 0 to 200g x 10
• 0 to 10g x 0.1g
• -01 Set of Supplementary Masses
• 1 kg, 500g, 200g and 100g
• -02 Support Rod for under weighing facility.
• -03 Un-calibrated Tare Beam of capacity 200g.

A high-form balance with four beams, each provided with a non-removable sliding mass, has total weighing capacity of 311g. No additional mass is required. Provided with spring loaded zero adjust compensator and magnetic damping, it has a pan of 90mm diameter with two pouring spouts and handle. Height of stirrup approx. 180mm. A platform housed in the base can be used for density determination.

• Beams: 0-200 x 100g
• 0-100 x 10g
• 0-10 x 1g
• 0-1 x 0.1g

Tubular balance made from plastic. Each range is colour coded for easy identification. The balance can be used for both force and mass measurements. Spring action is clearly visible and zero adjustment is provided. Total length 250mm.

• Capacity Division
• -01 250g/2.5N 5g/0.05N
• -02 500g/5N 10g/0.1N
• -03 1000g/10N 20g/0.2N
• -04 2000g/20N 40g/0.4N
• -05 3000g/30N 60g/0.6N
• -06 5000g/50N 100g/1.0N

These precision made mass sets are made from brass. The masses are finely adjusted, marked and mounted on a simple rack with handle.

• -01 Set of twelve masses: 1x500g, 2x200g, 1x100g, 1x50g, 2x20g, 1x10g,1x5g, 2x2g, 1x1g
• -02 Set of ten masses: 1x500g, 5x100g, 1x50g, 2x20g, 1x10g
• -03 Set of eight masses: 1x500g, 2x200g, 1x100g, 1x50g, 2x20g, 1x10g

Each set consists of nine equal masses on a carrier of the same mass.

• -01 Set of 10g masses, total 100g
• -02 Set of 20g masses, total 200g
• -03 Set of 50g masses, total 500g
• -04 Set of 100g masses, total 1000g

Each set consists of nine equal masses on a carrier of the same mass.

• Black Painted:
• 01 Set of 10g masses, total 100g
• 02 Set of 20g masses, total 200g
• 03 Set of 50g masses, total 500g
• 04 Set of 100g masses, total 1000g

• Nickel Plated:
• -05 Set of 10g masses, total 100g
• -06 Set of 20g masses, total 200g
• -07 Set of 50g masses, total 500g
• -08 Set of 100g masses, total 1000g

Masses are made of nickel plated brass and are accurately adjusted. Housed in a wooden box with forceps. Set consists of masses 1g to 100g. Fractional masses are from 1mg to 500mg.

• -01 Set of twelve masses: 1x500g, 2x200g, 1x100g, 1x50g, 2x20g, 1x10g, 1x5g, 2x2g, 1x1g
• -02 Set of ten masses: 1x200g,1x100g, 1x50g, 2x20g, 1x10g, 1x5g, 2x2g, 1x1g
• -03 Set of nine masses: 1x500g, 2x200g, 1x100g, 1x50g, 2x20g, 1x10g, 1x5g

Hexagonal masses provided with suspension ring.

• -01 100gm
• -02 200gm
• -03 500gm
• -04 1000gm

A pair of trolleys for investigating momentum, velocity, acceleration and energy conservation. Both trolleys are identical and each consists of a rectangular wooden body carried upon three low friction wheels to ensure smooth straight operation. One trolley is supplied with one strong spring plunger. The trolley is provided with three dowel pegs so that the trolleys can be stacked upon one another. This enables the effective mass to be increased. In front of each trolley, two holes are drilled and fitted with corks. If long pins are pushed through the corks of one of the trolleys, they can be made to stick together after collision.

RM5029 Second Law of Motion Apparatus

This apparatus demonstrates Newton’s Second Law of Motion. It consists of a spring-loaded device to show that a ball released vertically will hit the floor at the same time as a ball propelled horizontally. It is provided with a detachable rod which enables to clamp the apparatus on a stand or table. Includes 2 steel balls.

For the measurement of speed and acceleration. It operates on 12V AC and is safe for students. Paper tape, drawn through guides, is struck by a dotting screw carried on the armature. On wooden base with 4 mm sockets. Includes one roll of tape and 12 carbon discs.

RM5032 Transformer: Suitable for RM5031 Ticker Tape Timer AC. Input 220V AC., Output 12V AC.

This is operated by two dry cell batteries (not included). It produces 30 to 50 dots per second. The wooden base provides stability. Includes one roll of tape and 12 carbon discs.

RM5037 Carbon Discs: Pack of 48.

This force table is designed for force and vector demonstrations. Table is constructed of machined aluminum (40 cm dia) and graduated in degrees around its full circumference. Unit is mounted on a heavy stable tripod base with levelling screws. Consists of 4 pulleys, 4 weight hangers and 4 sets of slotted weights.

Contains the necessary equipment to demonstrate several basic principles like torque, lever and center of gravity. Consists of a wooden support stand, a 50 cm meter stick, 50g and 100g knife edges masses.

A simple apparatus to demonstrate that a body propelled horizontally will fall vertically at the same rate as a similar body allowed to fall freely. Comprises of a spring loaded L-section launcher. There are holes in it for placing two 19mm dia ball. When the launcher is released by a push button, one ball falls freely whereas the second ball is projected forward. Mounted on a wooden box with a storage pocket for balls. Includes two steel balls.

A simple apparatus to demonstrate both centripetal acceleration and conversion of potential energy into kinetic energy. A steel ball released at the upper end of the loop, it gains enough energy to transverse the loop without falling. Comes completely assembled on a wooden base.

This pulley set is an ideal set up to demonstrate law of conservation of energy, concepts of force and mechanical equilibrium. Contains a 15x25cm wooden base with mounted capstan and a screw eye. The set has a 62.5cm vertical support rod and a 21cm crossbar with clamp, eight single pulleys, 2 double pulleys, a wheel and axle, six pulley clamps, 90° clamp, nine slotted masses ranging from 10g to 1000g, seven weight hangers, and a pulley cord.

Suitable for use with ordinary laboratory apparatus. Plastic pulley of dia 3.8cm dia, mounted on a metal rod. Overall length is about 17.5cm.

RM5052 Pulley Blocks

Consists of free running, well balanced plastic pulleys. Each pulley measures 5 cm dia. and is mounted in an alloy frame with hook at each end.

• -01 Single Pulley
• -02 Double Pulley
• -03 Triple Pulley
• -04 Quadruple Pulley

RM5053 Tandem Pulleys

• -01 Double Pulley (3.8cm and 5cm dia.)
• -02 Triple Pulley (2.5cm, 3.8cm and 5cm dia.)

This 70mm dia. Pulley on a metal clamp, holds firmly in either a vertical or horizontal position. The bracket can be clamped to a bench edge of thickness 38mm.

Ball bearing, four coaxial pulley mounted on a single steel rod. Can be attached to any right-angle clamp.

For determining the value of ‘g’ by measuring the time taken by a falling steel ball. The apparatus consists of a release unit and a trip unit. Both these units size 13x9x1cm are fitted with 4mm sockets and can be readily clamped on to a 12mm diameter rod. The release unit is fitted with a small solenoid type electromagnet which holds a steel ball. The solenoid helps in the prompt release of the ball on being disconnected. The trip unit has a swinging plate and is fitted with a switch. The switch is normally held closed by a magnet and is opened when the ball falls on the plate. The time of fall is measured by a digital Centisecond Timer. Supplied complete with steel balls but without Centisecond Timer, retort stand and base.

• -01 Centisecond Timer for ‘g’ by free fall apparatus.

Suitable for study of linear motion under nearly frictionless conditions. The kit consists of square section aluminum track, length 1.5m, with two rows of fine holes along the top. Supported on two light alloy castings. One support has a two point contact and other a one point contact for lateral and horizontal adjustments by means of a knurled screw. One end of the section is fitted with a tube for connection to blower and the other end is closed.

Comes complete with following accessories:

• 2 heavy and 1 light vehicle with their mass ratio 2:1.
• 2 Magnetic buffers
• 2 Plasticine Holders with central hole
• 4 Catapults with slots for elastic band
• 1 Reel of nylon thread
• 2 White rods(4 mm diam.150 mm long)
• 24 Needles
• 20 Black plain cards
• 1 Pack of plasticine
• 20 Elastic bands
• 1 Instruction manual

Electric air blower with adjustable speed control. Suitable for use with Linear Air Track Kit. Supplied complete with air hose. Input 230V AC

A wooden planed board 60x7.5cm. The board is hinged at one end to a wooden base board and the angle of incline can be fixed in a number of positions by a movable block. Complete with roller, pulley wheel and scale pan but without masses.

Constructed of metal, this inclined plane is hinged to a base. Unit is supplied with aluminum protractor and is graduated to 45°. The end of the inclined plane has an aluminum pulley attached to a clamp passing through an extension of one side of the plane.

RM5077 Hooke’s Law Apparatus

To demonstrate Hooke’s Law and conducting simple harmonic motion experiments. The apparatus consists of a 12cm long scale that is mounted on a simple stand and base, a spring with a weight hanger and attached pointer.

Consists of a brass scale 10cm long with vernier reading to 0.1mm and with V slide clamps. Includes ceiling attachment for wire, 5m long wire and a tension weight.

This apparatus is capable of greater sensitivity and accuracy. It consists of two iron frames connected by a link. The frames are fitted with self centering chucks. An accuracy cut micrometer screw to read to 0.01mm and main scale of

0-10mm is fitted in one frame. One end of a sensitive spirit level is pivoted to one of the frames and the other end rests on the point of a micrometer screw fitted on the other frame.

RM5075 Pendulum Bob

Brass sphere with hook.

• -01 Diameter 13mm
• -02 Diameter 19mm
• -03 Diameter 25mm

For illustrating the principle of gyroscope action and conservation of angular momentum. It shows that the gyroscope will keep its axis of rotation to retain any particular position in which it may be placed as long as the speed of rotation of the disc is maintained.

Kit consists of five wooden beams 60x4.4x0.5cm graduated every 3.8cm with a groove across its center to locate fulcrum. Includes 5 fulcrum supports and 40 metal weights 2.5cm square.

This free fall experiment demonstrates that in the absence of atmospheric drag, bodies of different density and mass fall through a given distance in the same time. Made of glass tube 60cm long with stopcock to be connected to a vacuum pump.

For demonstrating reciprocal density. Comprises of six cylinders of different densities but all of equal mass and cross sectional area. Set consists of one each of lead, zinc, brass , copper, aluminum, iron. The lengths are inversely proportional to their respective densities.

Set of six 25mm cubes one each of lead, zinc, brass, copper, aluminum, iron, all with equal volume but different masses.

For finding the volume of a solid by displacement of water/liquid. Made of nicely painted iron sheet with a spout.

• -01 Size 100x65mm
• -02 Size 180x110mm

For demonstrating the principle that the pressure in a liquid is transmitted equally in all directions. Consists of a glass bulb approx 50mm diameter with a plunger.

Demonstrates capillary rise, which depends on inside diameter of the tube. Consists of six capillary tubes 125mm long, ends ground, of various bores between 0.5 and 2.25mm, supported by frame in a shallow metal trough.

For demonstrating that level of the liquid in a connecting vessel is same regardless of the shape and size of the vessels. Consists of four different shaped vessels on a wooden base.

For demonstrating the principle that the pressure increases with depth. Made of metal, having three orifices of equal diameter at different heights

Bucket and cylinder for demonstrating that a body submerged in water loses weight equal to its own volume of water. Made of nickel plated brass.

For demonstrating the force exerted by atmosphere. Made of light walled sheet metal can of height 265mm and diameter 75mm. Provided with an air tight stop cock.

For demonstrating force from atmospheric pressure. Consists of two metal hemispheres, of approximately 65mm diameter provided with a stopcock and a removable handle on one of the hemispheres.

Excellent for determination of specific gravity of liquids. Constructed of borosilicate glass with ground glass stoppers.

• -01 Capacity 25ml
• -02 Capacity 50ml

This hydrometer has a specific gravity range of 0.7000 to 2.000. All glass.

All glass permanently marked hydrometers.

-01 For light liquid, 0.700 to 1.000

-02 For heavy liquid, 1.000 to 2.000

Made of nickel plated brass and for liquids lighter than water. Floats exactly vertical when loaded. Supplied without masses. Approx. 25cm long.

For the measurement of actual (absolute) gaseous pressure. This apparatus is a laboratory demonstration version of the standard Bourdon type of pressure gauge widely used in industry. The instrument comprises of a circular gauge having an overall diameter of 100mm. The dial read 0 to 100 lb/in² and 0 to 7 Kg/cm². The gauge is carried upon a circular pillar 19x16mm diameter. A tubing 8mm diameter projects from the side of the pillar to provide connection with the system under investigation. The complete apparatus is provided with a heavy cast iron base.

Comprising two glass tubes, one closed at the top and the other open. Their lower ends are connected together by 1metre of rubber pressure tubing. Both tubes are mounted on sliding brackets which may be locked in any position on the metal supporting rods. The stand, made of metal, carries a scale graduated from 0 to 100cm in the center.

Supplied without mercury.

Easy to use manometer. Consists of a large U-shaped tube 50cm high and 2.5cm in diameter. The unit is mounted on a hardwood support with a metric ruler on both sides.

For demonstrating the principle that sound waves do not travel in vacuum. Consisting of a glass bell jar, with bell mounted on a rubber stopper and electrical terminals.

For study of principle of expansion of various metals by heating. Consist of two uprights linked by two rods, supporting an expansion bar, length 38cm, fixed to the upright and resting on a friction pointer placed at the other end. With reading 0 to 90°. With one each aluminium, steel and brass expansion bars.

Elongation of rod is measured by a dial indicator sensitive to 0.01mm. This apparatus is 10 times more accurate than other similar units. Includes one each aluminum, steel and brass bars.

To demonstrate the forces exerted on expansion and contraction. Consists of a rugged structure with slots at both ends to place an iron bar. The bar has holes at one end to hold breaking bars. With 10 breaking bars.

Comprising rods of different materials and some of different thickness to enable students to test for themselves different thermal conductivities. Kit comprises:

• Aluminum 3 8
• Glass 3 8
• Brass 1.5 & 3 8 each
• Copper 1.5 & 3 8 each
• Iron 1.5 & 3 8 each

This brass ball and ring demonstrates thermal expansion of the metals. The ball passes through the ring freely when both are at same temperature whereas the ball will not pass through the ring when heated. Comprises of a 25mm dia brass ball attached to the ring with a chain.

This brass ball and ring demonstrates thermal expansion of the metals. The ball passes through the ring freely when both are at same temperature whereas the ball will not pass through the ring when heated. Comprises of a 25mm dia brass ball and a brass ring both attached to separate wooden handles.

For demonstrating the thermal conductivities of metals. Consist of strips of copper, aluminium, iron and brass, fixed on a ring, meeting in the center with small cups formed on the outer ends.

To show linear and superficial expansion. Comprises of an iron bar fixed to a support rod with a wooden handle and a gauge with a cut out to admit the bar and holes which pass the bar endways when cold but do not when hot.

Made of stout tin sheet, nicely painted, with handle. Comprises of 4 equal rods of aluminium, copper, iron and brass, mounted in corks with one end in the tank.

For demonstrating unequal expansion of different metals upon heating. Comprises a strip of brass and iron, 20x2.5cm with wooden handle.

For showing convection currents in air. Comprises of metal box, 220x100x100mm with a removable glass front, two chimneys and candle holder fixed to the base of the box beneath the left hand chimney.

For demonstrating the rate of heat conduction in five different metals. The kit consists of five metal rods, approximately 20mm in diameter and 40mm long equally spaced on a brass disc and mounted on an insulated handle. The rods are aluminum, brass, copper, iron and steel and each having a cavity at the end for holding paraffin.

For demonstrating convection in liquids. Glass tube of 20mm diameter bent into a rectangle of approximate size 38x30cm, fitted with a funnel.

For determining the thermal conductivity of bad conductors. Three copper discs 42mm diameter x 12mm thickness each drilled to support a thermometer. A 6V D.C. Electric heater with wires led out to 4mm sockets and clamped in a wooden frame by means of a plastic screw.

For demonstrating the difference in expansion of different liquids over the same temperature. Consisting of five glass tubes with bulb of equal capacity mounted on a support, with scales and metal trough to hold hot water.

Hollow cube of 125mm side made from tin sheet with an opening at the top. The vertical surfaces are dull black, bright black, white and bright.

For demonstrating the mechanical effect of reflection and absorption of light and heat. Partially evacuated glass bulb has four vanes which spin on low friction pivot. Alternate vanes are dark and white in colour.

Set of six metal cylinders, diameter 20mm, of equal mass of aluminium, brass, copper, iron, lead and zinc. The cylinders are mounted in wooden stand and are drilled for suspension.

A simple junction of soldered wires, one each of copper and constantan 50cm long. Each wire is coiled for easy use.

Copper body and conical top. Fitted with inlet and outlet tubes and water gauge.

Actual working sectional model showing cross section of the piston and slide valve, method of turning steam on and off. All parts such as crankshaft, valve, control, drive wheel etc. are clearly shown.

RT5066 Calorimeter, Student

• -01 Aluminum construction.
• -02 Copper construction.

RT5067 Calorimeter, Electric (Joule’s)

• -01 Aluminum construction.
• -02 Copper construction

Enables students to investigate the nature of heat radiation and the radiating properties of different surfaces. The kit comprises:

• One radiant heater mounted on a base with mains lead
• One metal plate approximately 150mm square with handle
• One heat shield 220mm square with a 25mm diameter hole in the center
• One glass sheet 220mm square
• One book of aluminum leaf
• One pack of lampblack

RT5076 Sectional Model of 2-Stroke Petrol Engine

All parts made in aluminum alloy and metal. Ignition is shown by means of a miniature bulb. Carburettor or fuel supply also sectioned. With a crank handle for manual operation. Mounted on a metal base Height overall 34cm approx.

All parts made in aluminum alloy and metal. Ignition is shown by means of a miniature bulb. Carburettor or fuel supply also sectioned. With a crank handle for manual operation. Mounted on a metal base. Height overall 38cm approx.

All parts made in aluminum alloy and metal. Ignition is shown by means of a miniature bulb. Fuel supply also sectioned. With a crank handle for manual operation. Mounted on a metal base. Height overall 43cm approx.

All parts made in aluminum alloy and metal. Ignition is shown by means of a miniature bulb. Fuel supply also sectioned. With a crank handle for manual operation. Mounted on a metal base. Height overall 39cm approx.

Excellent for wave demonstration experiments. A flat sectioned helical spring, diameter 75mm.

• -01 Closed Length 110mm.
• -02 Closed Length 165mm.

For demonstrating transverse and longitudinal wave motion. The spiral measures 20mm diameter x 3m closed length.

For demonstrating the movement of progressive transverse waves. Comprising 22 small bails on wire rods, with eccentric motion attachment, driving handle and fitted on polished wooden base.

For demonstrating longitudinal and transverse motions. Consisting of a number of eccentric discs supporting a series of metal rods. On revolving the handle, transverse waves are obtained. Longitudinal waves are obtained with bent rods running in a metal guide.

Useful for demonstration of wave patterns. Consists of a metal tray with a plate glass base and detachable legs. A pair of support rods with clamps is provided to carry the wave generation system. A set of 4 metal reflectors is supplied consisting of a pair of straight reflectors 150x25mm, a curved reflector of 215mm chord length x 25mm high and a short straight reflector 25x25mm. A set of 4 loose gauze strips is provided to reduce unwanted reflections. The ripples are produced by a small 1.5V to 4.5V D.C. electric motor mounted at the centre with a row of holes to mount the spherical dipper for the production of circular ripples. Complete with accessories.

A 255mm diameter disc with twelve slots and a finger hole, rotated about a ball bearing mounted on a handle.

Quality tuning forks made from light weight aluminum alloy. Each marked with frequency and note.

• Note Frequency
• -01 C 256
• -02 D 288
• -03 E 320
• -04 F 341.3
• -05 G 384
• -06 A 426.6
• -07 B 480
• -08 C 512

Set of eight tuning forks made from aluminium alloy. Consists of C(256), D(288), E(320), F(341.3), G(384), A(426.6), B(480), C(512).

A set of four tuning forks, C(256), E(320), G(384), C(512), mounted on a polished wooden resonance box. Provided with a hammer

Made of hardwood. Size 30x9x5 cm with two rows of 10 holes each for standing tuning forks. Polished and lacquered. (Without Forks)

A pair of tuning forks mounted on individual resonance boxes, with one fork fitted with sliding mass to demonstrate beats. Changing the position of the boxes and the slider mass allow different frequencies and beats to be heard. Complete with hammer.

Use this hammer to minimize damage to the tuning forks.

A heavy steel fork of about 60 vibrations per second is mounted on a heavy cast iron base. The electromagnet is adjustable so that the amplitude of vibration may be varied between wide limits. Complete with mirror for Lissajou’s figures experiments.

A hollow wooden resonance box, with 100cm scale graduated in mm and fitted with three wires and keys. A pulley is attached to one end of the box. Complete with sliding adjustable.

For the measurement of sound wavelength. Comprises of a glass tube 100cm length and 35mm diameter mounted on wooden bases. A rod and a piston moves inside the tube to vary the resonant length.

A wooden baseboard 70x9cm mounted on four feet. At one end of the base are two 50N spring balances with hooks, and at the other end are two corresponding wrest-pins. Three bridges, one large and two small are provided. With two steel wires 0.3mm diameter x 1m.

Comprising two aluminium tubes telescoping into each other so that the column of air within the tube may be altered from 30cm to 53cm. Outer tube fits on a wooden base.

For easy measurement of velocity sound waves produced by tuning forks. Comprises of a glass tube 100cm long mounted on a stand which is fitted with levelling screws. The lower end of the tube is connected to a water reservoir by rubber tubing. The reservoir slides on a metal rod and can be lowered or raised for adjusting the length of air column.

Set of four wheels of 75mm diameter, mounted on a spindle. Ratio of teeth being 4:5:6:8. For use with Whirling Table No. RW5058.

For use in both vertical or horizontal position, fitted with hand wheel and belt driven pulley, with adapter for clamping accessories. Over all height 43cm.

This wooden organ pipe is used to study relationship between the frequency of the sound produced with the length of the air column. Consists of a sliding rod with chromatic scale. When fully extended the organ pipe is 70cm long.

RL5040 Plane Mirror Strips

Good quality mirrors for experimental purposes. Silvered with protective coating.

• -01 75x25mm
• -02 100x75mm
• -03 150x25mm
• -04 150x50mm
• -05 50mm diameter plane mirror

Wooden cube side 50mm, with cork lined slot for holding mirror strip.

High quality, silvered back with protective coating.

• Diameter            Focal Length
• -01 50mm          100mm
• -02 50mm          150mm
• -03 50mm          200mm
• -04 50mm          300mm
• -05 75mm          100mm
• -06 75mm          150mm

RL5043 Spherical Mirrors, Convex

High quality, silvered back with protective coating.

• -01 50mm          100mm
• -02 50mm          150mm
• -03 50mm          200mm
• -04 50mm          300mm
• -05 75mm          100mm
• -06 75mm          150mm
• -07 75mm          200mm
• -08 75mm          300mm

Made of glass with polished face and ground edges. Refractive index 1.52 approximately.

• Diameter 38mm     Diameter 50mm
• Focus mm             Focus mm
• -01 50                   -11 50
• -02 75                   -12 75
• -03 100                 -13 100
• -04 150                 -14 150
• -05 200                 -15 200
• -06 250                 -16 250
• -07 300                 -17 300
• -08 500                 -18 500
• -09 1000               -19 1000

Made of glass with polished face and ground edges. Refractive index 1.52 approximately.

• Diameter 38mm    Diameter 50mm
• Focus mm            Focus mm

Mounted on base, with V slot to hold lenses up to 75mm diameter. Made of wood, nicely polished.

RL5060 Equilateral Prism, Glass

60°x60°x60°, clear glass, refractive index 1.52 approx., polished faces.

• Face mm   Length mm
• -01 25              25
• -02 25              50
• -03 25              75
• -04 38              38
• -05 38              75

RL5061 Right Angle Prism, Glass, 90°x45°x45°

• Hypotenuse x Length mm
• -01 35x25
• -02 70x50

90°x60°x30°, clear glass, refractive index 1.52 approx., polished faces.

• Hypotenuse x Length mm
• -01 35x25
• -02 50x40
• -03 70x50

Set of six lenses with ground edges. Includes one each of Bi-convex, Bi-concave, Plano-convex, Plano-concave, Convexo-concave, Concavo-convex. Supplied with a wooden case for easy and secured storage.

• -01 Diameter 38mm
• -02 Diameter 50mm

RL5054 Rectangular Block, Glass

High quality glass block. All sides polished. Dimensions 115x65x10.

To demonstrate diffraction, spectrum formation & dispersion. Polished edges. Dimensions 75mm side x 10mm thick.

For determining the index of refraction and measuring the critical angle of light. Polished edges. Dimensions 70mm side x 10mm thick.

High quality glass block. All sides polished. Diameter 90mm, thickness 16mm.

Nicely cemented with colourless adhesive. Provided with a hole at the top and a stopper.

Equilateral prism of side 38mm, with a hole at the top to fill fluid for observation of refraction and dispersion.

Clear acrylic block. All sides polished. Dimensions 115x65x20mm.

Clear acrylic block. All sides polished. Diameter 90mm, thickness 16mm.

Clear acrylic block. All sides polished. Diameter 100mm, thickness 15mm.

Clear acrylic blocks. One side grounded. thickness 15mm.

Rectangle (75x50mm), Circular (Diameter 100mm), Semicircular (Diameter 75mm), Triangle (60°x60°x60°, Side 75mm), Triangle (90°x45°x45°, Hypotenuse 100mm), Triangle (90°x60°x30°, Hypotenuse 85mm), Two bi-convex lens 75mm long, Two bi-concave lens 75mm long, Two plane mirrors and one spherical mirror (Stainless Steel)

Rectangle (75x50mm), Semicircular (Diameter 75mm), Triangle (60°x60°x60°, Side 75mm), Triangle (90°x45°x45°, Hypotenuse 75mm), Triangle (90°x60°x30°, Hypotenuse 75mm), Two bi-convex lens 75mm long, One bi-concave lens 75mm long.

Consists of a plano-convex lens of 60mm diameter and 100cm focal length placed on a circular plane glass plate of equal diameter. Both enclosed in a frame with three compression screws for proper contact between lens and the plate.

RL5078 Equilateral Prism, Acrylic

60°x60°x60°, clear acrylic, all faces polished.

• Face mm Length mm
• -01 25 25
• -02 25 50
• -03 25 75
• -04 25 100
• -05 38 38
• -06 38 75

90°x45°x45°, clear acrylic, all faces polished.

• Hypotenuse x Length mm
• -01 35x25
• -02 70x50

Set of five school grade equilateral prism, made of high quality acrylic. The face size of all the five prism is 25mm. Lengths are 25mm, 50mm, 75mm, 100mm and 150mm.

A set of optical accessories for performing various experiments in reflection, refraction and colour. The key element is a ray box which has a metal lamp housing 155x70x55mm having an open front with finned sides to dissipate heat. It has four apertures one to accommodate the slit plate and another three for mounting colour filters. The two side apertures are fitted with hinged plane mirrors. With metal plate having single and triple slits and whitened on one side for use as returned image screen, 12V lamp and a lamp holder.

Optical Accessories

• 5 Prisms (rectangular, semi-circular, triangular 60°x60°x60°, triangular 90°x60°x30°, triangular 90°x45°x45°)
• 3 Cylindrical lenses (one double concave, one double convex, one thick double convex)
• 3 Mirrors (curved parabolic, curved semicircular, mirror on stand)
• 2 Slit plates
• 8 Colour filters
• 6 Colour cards

Set comes complete with a replacement bulb but without power supply.

• -01 Complete Set
• -02 Raybox only
• -03 Power Supply
• -04 Replacement Lamp

These gas filled spectrum tubes are used for studying spectra given off by various gases when discharges are passed through them. Consists of two glass bulbs connected by a capillary tube at the middle. Total length 200mm.

• -01 Argon
• -02 Carbon-dioxide
• -03 Helium
• -04 Hydrogen
• -05 Mercury
• -06 Neon
• -07 Nitrogen
• -08 Oxygen
• -09 Water Vapours

This instrument is designed for high performance student use. It has cast aluminium alloy main structure. The collimator tube is mounted on the fixed pillar and telescope tube on the movable. Both the collimator and the telescope have 175mm focal length, 32mm clear aperture object glass at their one ends. The collimator has a precision slit 6mm high and telescope has Ramsden’s eye-piece 15X at their other ends. Both collimator and telescope have rack and pinion focusing and means for levelling their axes and squaring them to the axis of rotation.

The scale 127mm diameter with protective shield is fixed to the telescope movement and the prism table is attached to the double ended vernier which reads to 1 minute arc. Both telescope and table can be rotated independently by hand about the same vertical axis. These can be clamped at the desired positions and adjusted precisely with the help of fine adjustment screws.

Prism table is marked with lines to assist placing the prism with respect to the table levelling screws and has screwed holes for fixing prism and grating holders. Prism holder can accommodate prisms up to 38mm high. Supplied with prism holder, grating holder, magnifier glass, tommy bar for adjustment of optical axis and dense flint glass prism, equilateral 32x32mm. In plywood case.

Heavy cast aluminium alloy base integral with collimator tube support. Both the collimator and telescope have 175mm focal length and 25mm aperture object glass at their one ends. The collimator has precision slit and telescope an 8X Ramsden’s eye-piece at their other ends. Focusing is done by helical action device. The scale 175mm diameter is divided in degrees and is read to 0.1 degree (6 minutes of arc) with the help of the vernier fixed to the telescope arm. The scale can be rotated through 180° and locked in any desired position. The telescope has both the coarse and fine adjustment for exact readings. The prism table, 75mm diameter, has screwed holes for fixing prism and grating holders. It has lines marked to assist placing of prism with respect of table levelling screws. Prism holder can accommodate prisms up to 38mm high. Supplied with prism holder, grating holder and tommy bar for adjustment of optical axis.

Useful for classroom demonstration and laboratory observations. Instrument provides a wide spectrum of any visible light source. Both emission and absorption spectra can be viewed. Features a 10x10mm Amici type 3-element prism train, telescopic focusing housed in brass body and variable optical slit adjustable by knurled head rotating ring. Wooden storage case included.

Portable and precise, the instrument provides direct wavelength readings of visible spectrum from 400nm to 750nm with each scale division representing 5nm. The spectrum is viewed in the plane of scale and for error free readings, D-line on scale can be adjusted. Incorporates a 10x10mm Amici type 3-element prism train, telescopic focusing housed in brass body and variable optical slit adjustable by knurled head rotating ring. Wooden storage case included.

• -01 Glass Rod, 300x12mm
• -02 Ebonite Rod, 300x12mm
• -03 Acrylic Rod, 300x12mm
• -04 Half Brass - Half Glass Rod, 300x12mm
• -05 Half Brass - Half Ebonite Rod, 300x12mm

• -01 Silk, 300x300mm square
• -02 Flannel, 300x300mm square

• -01 Polythene, Low density 250x25x4.5mm
• -02 Cellulose acetate, 250x25mm

Consist of a brass disc 25mm diameter mounted coaxially on an ebonite rod.

Consist of a brass sphere 25mm diameter mounted coaxially on an ebonite rod.

• -01 Cone 100x50mm (Length x Max. Diameter)
• -02 Cylinder 125x50mm (Length x Diameter)
• -03 Sphere 50mm (Diameter)

RE5029 Discharger

Comprises of two curved brass rods with knobs joined by a hinge with two insulated handles.

RE5030 Hollow Sphere, Brass

Hollow sphere of 80mm diameter, with hole at top, on an insulated stand.

RE5031 Biot’s Conductor

To demonstrate that charge resides only on outer surface of a conductor. Sphere 50mm diameter on insulated stand, complete with hemispherical cups having insulated handles.

RE5035 Flask Type Electroscope

Consists of 250mL borosilicate glass conical flask with a stopper which supports a metal rod with disc.

This electroscope comprises of a metal case with transparent front and back. The highly insulating bush at the top of the case takes either a disc top plate 50mm diameter or a metal hook. It has a transparent scale and is fitted with a 4mm socket.

Hand operated apparatus, ideally suited for high voltage demonstrations. Consists of two insulating discs of diameter 300m fixed with equally spaced thick sectors of tin foils. Special condensers, strong and heavy iron bearing supports, sturdy construction, smooth and silent driving mechanism.

Motor driven suitable for usual electrostatic experiments. Consists of an aluminum sphere 175mm diameter and a spherical discharger 75mm diameter mounted on an insulating rod. Voltage developed up to 250kV with spark length up to 50mm. Fitted with 4mm earth sockets. The motor runs on 220 to 240V/ 50Hz. Provided with On/Off switch and fuse protection.

Hand operated on a wooden base. The generator is self exciting. The unit is fitted with a large pulley with a handle, which drives the upper pulley assembly through a belt. The charge builds up until electrical breakdown of air surrounding the sphere occurs.

The set comprises of:

• Faraday’s Pail
• Perspex cylinder with suspended metal sphere
• Head of hair
• Point discharge
• Electric whirl
• Neon Bulb
• Electric Tester

RE5045 Potentiometer

With 4 gaps, nickel plated brass plates and connecting pieces, with 4mm socket terminals, fitted on wooden base. Wooden scale graduated 0-100cmx1mm. Complete with knife edge jockey.

With plated brass knife edge mounted in insulated handle 80mm long. Provided with a plated brass 4mm socket terminal for connection. Overall length 110mm.

Consists of four dials in series of ranges X1, X10, X100, X1000 having total resistance 11110 ohms. Two ratio dials having resistance of 1, 10, 100, 1000 are provided. Terminals for connecting galvanometer and battery with press keys are also provided. The unknown resistance is connected between two terminals marked ‘X’.

The instrument can also be used as four dial decade resistance box and two terminals for connecting it in series are also provided.

A 12 position rotary switch selects values, 33S, 100S, 330S, 1kS, 3.3kS, 10kS, 33kS, 100kS, 330kS, 1MS, 3.3MS, 10MS.

Consist of seven carbon resistance of values 1ohm, 4.7ohm, 10ohm, 100ohm, 1000ohm, 10kohm, 100kohm mounted on an acrylic board. Each resistor is provided with a pair of 4mm socket connections.

Enclosed in an an aluminum case, this unit has coils of double silk covered manganin wire, wound non-inductively so the box is suitable for both AC And DC use. Provided with two 4mm socket terminals for connections. Accuracy "0.1%.

• No. of Dials Steps ohms Total ohms
• -01 One 0.1 1
• -02 One 1 10
• -03 One 10 100
• -04 One 100 1000
• -05 One 1000 10000
• -06 Two 0.1,1 11
• -07 Two 1,10 110
• -08 Two 10,100 1100
• -09 Two 100,1000 11000
• -10 Three 0.1,1,10 111
• -11 Three 1,10,100 1110
• -12 Three 10,100,1000 11100
• -13 Four 0.1,1,10,100 1111
• -14 Four 1,10,100,1000 11110