Physics Instruments

One can find the modulus of rigidity and Young's modulus for the material of a wire by Searle's method. The 30cm long wire under test is connected to two brass rods about 30 cm long at their mid points by two screws fitted at the ends of the wire. The rods are suspended from hooks. Complete with three test wires and connecting screws.

It consists of an iron rod of length 16" and diameter 1". The circular rod is graduated 15-0-15 cm. The circular weight with thumb screw which fits into the rod is also provided. Supplied with cast iron wall bracket.

For specific heat capacity experiments. Lead is supplied as pellets, other metals as rivets. Packs of 500gm.
A Aluminium
B Brass
C Copper
D Iron
E Lead

To show the convection of heat in a liquid. Glass tube 20mm, outer dia. bent in rectangle approx 380x300mm, fitted with filling funnel. Made of Borosilicate glass.

Comprising of six equal rods of copper, iron, lead, brass, zinc and aluminum, each 130x3mm dia, mounted in corks with their lower ends in a tank 210x75x75mm. The tank is supported on four legs at a height of approx 170mm above the bench. In use, the rods are lightly coated with paraffin wax and the rates of melting compared.

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For demonstrating the difference in thermal expansion of various liquids. Comprising of five bulb tubes with plastic scales, mounted in a frame and supported in water trough 240x108x77mm deep. The frame has clamps to secure it to the trough and two cross members, the lower cross member having holes, and the upper, tubules to locate the bulb. Dimensions overall 240x115x460mm high approx. Bulb dia 35mm, bulb stem 400mm. Scales 0-25cm in millimeters.

Comprising of a cylinder 200x30mm dia. one half of which is wood, the other metal. If paper is wrapped tightly round the cylinder and the rod is held above the flame, the portion in contact with the wood will be quickly scorched while the portion in contact with the metal will remain unchanged.

For showing the difference in conductivity. Rod 300x18mm length x dia. half of which is of brass and half of polished wood joined together.

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Comprising of strips of copper, iron, aluminum and brass fixed on wooden square meeting in the center, outer ends of the strips formed with small cups.

New design. One each brass and iron plates 305x31mm riveted together from end to end, fitted with handle.

Comprising of two cast-iron uprights, height 18cm linked by two nickel plated rods supporting on expansion bar, length 38cm fixed to one upright and resting on a friction pointer placed at the other end. With scale reading from 0 to 90 degrees. With one each aluminum, brass and iron expansion bars.

To show the forces which can be exerted during thermal expansion or contraction. Comprising of a heavy cast iron frame 340 x 120 x 100mm with slotted end pillar to carry a stout iron bar. The bar is threaded at one end for a large tensioning nut and has holes at the other end to accommodate the cast iron breaking bars. Supplied complete with ten breaking bars. Spare bar for above 5 x 6 mm pkt. 10

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For illustrating expansion by heating and contraction by cooling. Comprising a mild steel bar 110x10mm, on rod with wooden handle, overall length 280mm approx, with metal cast gauge, sliding fit over ends of bar with hole 10mm bore, in one arm.

An apparatus for demonstrating thermal extension, as illustrated. Fitted on two separate handles.

An apparatus for demonstrating thermal expansion, comprising of a captive brass ball secured to a mounted brass ring by a chain. Ring mounted rod with wooden handle. The ball passes through the ring when cold but will not pass through when heated, ball dia 25mm. Same as above but ball dia. 19 mm