Abstract
A rotatable metal-block-calorimeter with thermoelectrical measurement of temperature is described. The platinum-lined combustion block is made of electrolytic copper. The zero-blocks, set up symmetrically on both sides of it, are of pure aluminum. Eight thermo-piles, with 50 elements each, are used for measuring. The small combustion-shell, also of platinum, is freely suspended so that its contents are never spilled during rotation. The whole calorimeter, is mounted on bearings, and is housed in a high-vacuum container, which can be evacuated down to a pressure of 10—5mm Hg. A multi-jacket thermostat is used for thermal isolation. In the outer jacket the temperature constancy is better than 10-3°C. The sensitivity of the calorimeter has been tested by the burning of some typical substances.
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