Heat Capacity of Fine Wires

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Abstract
A wire enclosed in an evacuated tube is placed in one arm of a Wheatstone bridge and brought to the temperature at which its heat capacity is to be determined. With the bridge balanced, galvanometer key closed, and battery key opened, a charged condenser is connected across the battery terminals of the bridge. The heat capacity is evaluated from the resulting ballistic deflection. In an alternative procedure, the bridge is initially unbalanced so that discharge of the condenser gives zero deflection. The method has been tested on pure platinum in the neighborhood of room temperature. The over‐all accuracy is estimated at ½ percent. The internal consistency is much better. A table is given of the authors' results together with the best previous measurements.