A material, invented by Charles Edouard Guillaume , whose "rigidity" (elastic modulus) stays very nearly the same over a wide temperature range. As such, it is useful for clock springs and precision measurement. (Contrast Elinvar -- constant elasticity, as desired for a precision spring, with invar -- constant dimensionality (zero thermal coefficient of expansion), as desired for a length standard.

Guillaume won the Nobel Prize in 1920 for the discovery of Elinvar, invar, and many other nickel steel alloys with characteristics tailored by varying their composition.

Log in or registerto write something here or to contact authors.