A NEW ADIABATIC CALORIMETER

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Abstract
A new adiabatic calorimeter equipped with a radiation thermel is described. Measurements of the heat capacity of ice over various temperature ranges are presented in order to illustrate the method of handling the calorimeter and to find the order of accuracy of this piece of apparatus. The latent heats of fusion of ice at 0 °C. and at − 3.0 °C. are found.The novel feature of the new calorimeter is shown to be the radiation thermel for indicating any difference between the temperatures of the inner calorimeter and the outer bath. This instrument consists of a multiple junction thermocouple of which one set of junctions receives heat from the inner calorimeter vessel by radiation. The accuracy of the calorimeter is shown to depend on the magnitude of the temperature drop in the inner vessel and on the method for reading the temperatures involved. In the experiments with ice a probable accuracy of about 0.2% is obtained with temperature drops of the order of 2°, measurement of which is made with a Beckmann thermometer.

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