An alloy material called invar is used for the tuning rod because of its nearly zero temperature coefficient. It is relatively invariant with wide temperature changes. Figure 8 1: This is a cutaway ...
The pendulum of this mid-century beauty is made of the alloy invar, selected for its exceptionally low coefficient of thermal expansion. This ensures the pendulum doesn’t change length with ...
It's also used in all sorts of alloys. There's Invar which is a kind of metallic pyrex, that doesn't expand or contract when you change the temperature. There's Monel, a steel so corrosion resistant ...