Disk 1 has two mutually perpendicular diametral grooves a. Sliders 2 and 3 move along these grooves. Link 4 is connected by turning pair D to slider 5 which moves along fixed guides. If slider 5 is removed and disk 1 is held stationary, the mechanism is converted into an ellipsograph (elliptic trammel) in which all points of link 4 describe ellipses. In one revolution of shaft A, piston 5 has two double strokes (back and forth).
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