Piston 1 reciprocates in cylinder 4 which turns about fixed axis A. Rod a of piston 1 is connected by turning pair C to cam 2 which turns about fixed axis B. As piston 1 is moved by fluid delivered to cylinder 4, cam 2 is turned and it reciprocates link 3 in fixed guides b. Link 3 is held in contact with cam 2 by its weight.
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