The wires used in these experiments were furnished through the kindness of Dr. A. G. Worthing of the Nela Laboratory of the General Electric Company, of Cleveland, Ohio. There were five specimens from each of two different sets of wires. Thus each group of five wires was drawn from the same original swaging. The wires range in radius from.002397 cms. To.02584 cms. Tungsten is very hard and brittle, and can be drawn only by experts. The tungsten has previously to be made very free from impurities, and then worked and swaged into a rough wire. This is then drawn down while red hot through holes drilled in diamonds. Even after this apparently successful treatment, the wires show a tendency to fray and split when clamped. Thus their structure is far from uniform and homogeneous.
Proceedings of the Iowa Academy of Science
©1917 Iowa Academy of Science, Inc.
Sieg, L. P.
"On Certain Elastic Properties of Drawn Tungsten Wires,"
Proceedings of the Iowa Academy of Science, 24(1), 207-211.
Available at: https://scholarworks.uni.edu/pias/vol24/iss1/32