Gear rack b, cut on indicator spindle 1, meshes with pinion 2 which is rigidly attached to a shaft together with gear 3. Gear 3 meshes with gear 4 which is rigidly attached to a shaft together with gear 5. Gear 5 meshes with pinion 6€ to which hand a is rigidly attached. Backlash in the gearing and between rack b and pinion 2 is eliminated by pressure gear 7 and spiral spring 8. The contact pressure required in measurement is applied by spring 9.
$2966$CxG,M$