The heater is a tiny nichrome wire wound on an insulator, self-powered by the 24 VAC of the system’s leads (a sort of energy harvesting) and positioned so it warms the bimetallic strip (Figure 4).

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THE British Thomson-Houston Co., Ltd., has sent us specimens of a new bimetallic strip for use in thermostatically ... and even on heating the bond will not be broken so long as the temperature ...

There have been many attempts at using this waste heat to generate electricity ... and the whole device bends like the bimetallic strip in a thermostat. It droops toward the cold surface, where ...

The (long) video starts off with making a DIY bimetallic strip out of titanium and brass, which it pretty fun. After some math, it is tested in a cup of hot water to ballpark the deflection.