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).

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 ...

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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.