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The applications of the inverse Wiedemann effect to torque measurements and to torque variation recordings were devised by the writers and the details of the experiments were published in the Reports, Vol. IV, No. 52, and Vol. V, No. 54 (see AIRCRAFT ENGINEERING, Vol. II, July 1930, p. 186. If a ferro‐magnetic bar is furnished with a twisting arm, a force, or variations of a force, can be measured in the same way. The writers constructed a pressure indicator for an internal‐combustion engine and obtained satisfactory results.