Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element
a) Iron
b) Copper
c) Aluminium
d) Nickel
Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element
a) Iron
b) Copper
c) Aluminium
d) Nickel
