The work by Guthe, Guthe and Sieg, and Sieg, on platinumiridium wires when used as suspensions for torsion pendulums, showed some remarkable elastic properties of that alloy. The principal one of these was the variation of the period with the amplitude of vibration. It was these studies that made it seem very desirable to test other alloys commonly used for suspensions, by a similar method.
Proceedings of the Iowa Academy of Science
©1916 Iowa Academy of Science, Inc.
Oehler, A. J.
"Certain Elastic Properties of Phosphor-Bronze Wires,"
Proceedings of the Iowa Academy of Science, 23(1), 213-234.
Available at: https://scholarworks.uni.edu/pias/vol23/iss1/37