Container 1, filled half full with a low-boiling liquid, is connected by tube 2 to Bourdon tube 3. Tube 2 and the Bourdon tube are filled with a special liquid having a viscosity so high that it does not pour out of the tubes. A change in temperature of container 1 changes the pressure of the saturated vapour of the liquid in the container. This pressure is transmitted to the viscous liquid filling the Bourdon tube. Tube 3 is deformed and the motion of its free end is transmitted through link 4 and segment gear 5, turning about fixed axis A, to pinion 6 and hand 7, rigidly attached to the pinion and turning about fixed axis B.
$4066$EHP,M$