A concrete demostration of the cubic expasion of a solid. Ring with wooden handie and ball on chain.

Demonstrates the effect of contraction of a solid.

Heavy cast iron construction. Complete with 12 breaking bars.

Spare parts for 4200.29:

4200.31 Set of 12 metal breaking bars

Pointer moving over scale reading 0-90° shows the expasion of a metal rod when heated. Complete with three different metal rods and trough for alcohol. Mounted on metal base with dimens . 280 x 80 mm.

Demonstrates how the unequal expansion of different metals may be used for practical applications (principle bimetallic thermostats , switches, etc). A Bunsen burner or alcohol lamp is required for the heating of the bar.

Stainless steel boiler with hermeticallysealing lid on which are mounted a Bouredon pressure gauge (from 0 to 2.5 atmospheres ), one safety valve, one gravity-operated safety valve, and a thermometer  housing. The boiler is used to determine the temperature pressure curve.

Accesory for 4205.20:

Thermometer,-10°C to + 250°C (cat. 2240.25)

For the verification of relationship of the expasion of a gas at constant pressure and the increase in temperature (Gay-Lussac's law). Includes : three - limb glass tube with one limb graduated terminating in glass bulb ; a glass vessel with PVC lid; metal stirrer; two Mohr clips.

Three-limb glass tube, spare

0300

Distilled mercury ,500 g

Thermometer - 10°C to + 100°C x 1°C (cat.2240.15)

Allows for the qualitative comprarison of the thermal conductivity of various substances in the from of bars protruding from a pan to which a heat source (hot water) is applied . A layer of wax is applied to the rods which are then heated by filling the pan with hotwater. The different thermal coductivities of the rods are shown by the varying rates at which the wax meltes.

4210.72

THREE-ROD CONDUCTIVITY APPARATUS

Demonstrates the different thermel conductivity of three metal rods.

It includes:

- Dewar vacuum vessel, capacity 500 ml (cat.4230.51)

-Cylindrical resin housing for insulation of the vacuum vessel (cat. 4230.53)

- Plastic lid with stirrer and thermometer  aperture (cat.4230.54).

Supplied without thermometer (see cat. 2240.36)

 Accessories for the study of joule's law (see cat. 4670.00).

Set of six cylinders of equal diameter (16 mm ) and mass (100 g) in aluminum, iron, brass, lead, copper, and zinc.

1 Historically accurate

1 Conceptually stimulating

1 Results with error under 10%

The simple apparatus is historically important, allows for the correlation of several fundamental concepts, yields accurate results, and can be applied in group work. The  apparatus basilically consists of a calorimetric body containing water, wound with a fibre cord on which is hung a known mass. A thermometer with 1/10°C divisions is used to measure the temperature of the water. When the calorimeter is rotated, the mass is suspended by the force  of friction, and the weight of the mass. The calculation of the mechanical equivalent of heat is made on the basis of the weight applied, the number of rotations made by the calorimeter, the volume of water in the calorimeter, its temperature increase, and the constants of the apparatus. Experimental measurements result in :

KJ4.3 A 0.4  joule/calorie

Which agrees, within the limits of expermental error, with the expected value K J 4.185 Joule/calorie.

Accessories for 4235.10

Mass of 5 kg (cat.411.26)

Thermometer , range-10°C to + 50°C.

Division 1/10°C (cat. 2240.30)