Elementary Mechanism

addendum circle angle angular velocity annular wheel arc of recess arcs of approach axis base circle belt centre of motion circular arcs clock cloth common normal connected constant velocity ratio construction curve cycloidal cylinder dead points describing circle directional relation distance draw ellipse engine epicycloid equal evidently feet fixed centres flanks gear generatrix given groove hence hyperboloids hypocycloid inches instant intersection involute involute system latter least number length line of centres logarithmic spirals move number of axes number of teeth pair path perpendicular pieces pinion pitch circle pitch diameter pitch line plane point of contact position practical pulleys rack radial radii of contact radius ratchet-wheel revolutions per minute rolling contact rotation screw shaft shown in Fig sliding contact spur wheel straight line stroke surface swing-wheel synchronal rotations tangent tion tooth outlines train transmit motion turning vary wrapping connector