Elinvar
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Elinvar is the name of a type of metallic alloy with a modulus of elasticity which does not vary with temperature; the name means elastically invariable. The first work in producing it was done by the same man who had invented invar, the alloy of nickel and iron which has a small temperature coefficient of expansion. The initial use of elinvar materials was in watches which required that a mechanical vibration rate not change with temperature changes. It was also used in producing antimagnetic watches, though not so often as some other alloys with this properties (Nivarox, Glucydur, Invar).
Elinvar consists of 59% iron, 36% nickel, and 5% chromium and was invented by Charles Edouard Guillaume
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