Abstract

An apparatus for determining the mechanical equivalent of heat by measuring the heat developed within a stationary copper cylinder as well as the torque developed by it when placed in a rotating magnetic field, is described. The field strength is made unvarying with angular position by the actual rotation of an electromagnet with slip rings. Radiation loss is reduced to a minimum by immersing the copper cylinder in water contained within a thermos bottle. In addition to the mechanical and heat energy measurements, the equivalent electrical energy is measured at the same time.

© 1927 Optical Society of America

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