Link 1 reciprocates in housing a and is connected by turning pair A to pawl 7. Ratchet wheel 2 and pinion 3 are rigidly fastened together and rotate about fixed axis B. Gear 4 and cam 5 rotate about fixed axis C. Lever 6 turns about fixed axis D and has roll b which is the follower of cam 5. The motion of link 1 is transmitted through ratchet wheel 2, pinion 3 and gear 4 to cam 5 which is rigidly attached to gear 4. Cam 5 oscillates lever 6 which registers the number of strokes of link 1.
$1727$LC,M$