Concerning a New Method of Tracing Cardioids
Rigge, William F., S.J.
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First Paragraph: A cardioid may under certain conditions be traced by a point when its motion is the resultant of a rectilinear simple harmonic movement and a uniform angular one of the same period. The harmonic motion may be obtained from any plane mechanical contrivance such as a revolving crank and a sliding slotted bar, while the angular one is best furnished by a disk rotating under the pen.