WORKING with the transverse vibrations of wires of glass, steel, brass, aluminium and silver, Bennewitz and Rötger1 have found that the internal friction has a maximum at a frequency ƒ0 characteristic of each wire. They have found, in fact, that the internal friction varies with frequency ƒ approximately as
Bennewitz, K., and Rötger, H., Phys. Z., 37, 578 (1936).
Zener, C., Phys. Rev., 52, 230 (1937).
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Physical Review (1938)
Il Nuovo Cimento (1938)