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

A Calibrated Thermal Resistance Plate for Measuring Heat Flow

Carl G. F. Zobel
J. Opt. Soc. Am. 14(5) 409-422 (1927)

Some Experimental Methods in Magnetostriction*

S. R. Williams
J. Opt. Soc. Am. 14(5) 383-408 (1927)

Methods for Exciting and for Calibrating Tuning Forks*

Elias Klein and Glenn F. Rouse
J. Opt. Soc. Am. 14(3) 263-286 (1927)

Some Properties of a Hot Wire Microphone

Orin Tugman
J. Opt. Soc. Am. 15(2) 110-116 (1927)

A Device for Studying Mechanical Resonance in the Elementary Laboratory

Winthrop R. Wright and Alfred H. Croup
J. Opt. Soc. Am. 15(3) 178-180 (1927)