LEVER-GEAR MECHANISM OF A RECORDING THERMOMETER

Upon a change in temperature of the medium in which thermal bulb 1 is immersed, the pressure of the liquid filling the thermal bulb and Bourdon tube 2 changes. Tube 2 is deformed and the motion of its free end turns three-arm lever 3 about fixed axis A. Segment gear b of the three-arm lever meshes with pinion 4, which is rigidly attached to hand a and turns about fixed axis B. Hand a indicates the…