Gear rack a, cut on indicator spindle 1, meshes with pinion 2. Rigidly attached to pinion 2 are gear 4 and revolution-counter hand (telltale) 3 which indicates the number of whole millimetres of displacement of spindle 1 on a small scale (not shown). Rotation is transmitted through gear 5 to hand 6 which indicates hundredths of a millimetre on the large scale. Through profiled lever 7 spring 8 applies the measuring pressure to spindle 1. As spring 8 stretches, the arm of the applied force is reduced and the pressure on the spindle remains the same for its initial and final positions. Spring 9 eliminates backlash in the gearing.
$2965$CxG,M$