1) Alloy steel 2) Chrome-nickel steel
Found on
https://www.crosswordclues.com/clue/elinvar
Elinvar is a nickel steel alloy with a modulus of elasticity which does not change much with temperature changes. The name is a contraction of the French `elasticité invar`iable (elastically invariable). It was invented in the late 1890s by Charles Édouard Guillaume, a Swiss physicist who also invented Invar, another alloy of nickel and iron, .....
Found on
http://en.wikipedia.org/wiki/Elinvar
(from the article `Guillaume, Charles Édouard`) ...the volume of the litre, which he found to be 1,000.028 cubic centimetres, not 1,000.000 cubic centimetres as had been accepted. From 1890 he ...
Found on
http://www.britannica.com/eb/a-z/e/22
an alloy of iron, nickel, chromium, and other constituents, resistant to rust and magnetization and having a low rate of thermal expansion.
Found on
https://www.infoplease.com/dictionary/elinvar
No exact match found.
