A dramatic demonstration of the thermostat principle! Consists of a bimetal strip mounted in a wooden handle. Because of the unequal expansion of the two different metals, the bar will bend when heated which illustrates the operation of a thermostat. 

A.      Wooden handle, brass/iron 3.5x20cm

B.      Wooden handle, brass/iron 2x21cm

C.      Plastic handle, brass/iron 2x21cm

D.      Plastic handle, brass/iron 2x21cm

E.       Wooden handle, bi-metal