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�KINEMATICS OF MACHINERY.
�To find the pair-closure for the chain we must know its cen-
troids. As the opposite links 2, 3 and 3,4, 2,1 and 1,4, are
��FIG. 159.
�equal, the two pairs of centroids are similar, we need therefore
which fall upon each other during the rolling. The tangents to the curve at 2 will of course pass through E and f.
�
