invar

Noun

Meaning

an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments

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Examples

Invar pendulums were first used in 1898 in the Riefler regulator clock Milham 1945, p.331-332 which achieved accuracy of 15 milliseconds per day. Source: Internet

Invar and fused quartz Around 1900 low thermal expansion materials were developed which, when used as pendulum rods, made elaborate temperature compensation unnecessary. Source: Internet

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