The lengths of the links comply with the conditions: B͞C=B͞H, G͞H=D͞C and H͞K=C͞E. Added to the basic slider-crank linkage ABF are connecting rods 5 and 6 of symmetrically arranged slider-crank linkages GHK and DCE. When crank 1 rotates about fixed axis A, pistons 2, 3 and 4 reciprocate. Pistons 2 and 4 have equal strokes and, in the general case, they are not equal to the stroke of piston 3.
$1566$SC,PM$