During some experiments on the elasticity of a certain type of wires the question arose as to whether the restoring torque, during the actual vibration of the system was at all times proportional to the torsional strain measured from the zero position. It is easy to determine the answer to this question in the case of a static twist of the wire, but there seemed at first to be an unsurmountable experimental difficulty in determining the answer for the case where the wire is actually vibrating.
Proceedings of the Iowa Academy of Science
©1912 Iowa Academy of Science, Inc.
Sieg, L. P.
"A Method of Determining Whether the Restoring Torque is Proportional to the Torsional Strain During the Vibration of a Torsion Pendulum,"
Proceedings of the Iowa Academy of Science, 19(1), 189-190.
Available at: https://scholarworks.uni.edu/pias/vol19/iss1/34