Plunger 1 slides in fixed guide a and its tip b slides along lug c of lever 2 which turns about fixed axis B. The cam surface d at the right end of lever 2 slides along point e of link 3 which slides in fixed guide f. Point g of link 3 slides along cam surface h of lever 4 which turns about fixed axis C. The motion of link 1 is transmitted by links 2, 3 and 4 to a hand (not shown) which is rigidly attached to lever 4. For adjustment, guide f of link 3 can be turned as required about fixed axis A and clamped in the required position.
$1728$LC,M$