ocr: One wayt that "rotary motion can be converted into Creciprocal motion is through the use - - ofa "cam, a mechanism known since antiquity( - (62A.D.). The profile ofa - - "cam is not centered. Asitrotates, it toves a cam follower up and down. Thus, the "rotary motion of the cam is converted to Creciprocal motion in the follower. The motion of the follower can alsobe plotted asa - graph.