Upward motion of measuring spindle 1 turns lever 2 with gear segment a about fixed axis A. This transmits rotation to pinion 3 with hand b. Flat spring 4 holds lever 2 against spindle 1 and spring 5 holds the sensitive contact against the workpiece with the required pressure. Lifting lever 6 retracts spinale 1 with the sensitive contact.
$1780$GL,M$