Dunkerley, Stanley, 1870- · London, New York [etc.] Longmans, Green · leaf 216
construction for a number of positions of the mechanism, a polar curve of angular velocity for the second shaft may be drawn. For a quarter of a revolution, it is shown by the MECHANISMS CONSISTING OF FOUR LOWER PAIRS. 205 chain-dot line, the corresponding curve, for the first shaft beingthe… … Fig. 2ie. from its circumference (Fig. 216). It is then frequently termed auniversal ^pint. When used as a coupling for power purposes, thevariation in velocity ratio gives rise to vibratory and unsteadymotion; and to obviate this, a Double Hookes joint, or doubleuiuversal coupling, may be used.…
Machinery, Kinematics of
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