The lengths of the links of four-bar linkage DABC comply with the conditions: A͞B=B͞C=B͞M=1, A͞D=0.136 and C͞D=1.41. For the specified dimensions, point M describes a path that differs only slightly from a circle. When link 1 is rotated clockwise, point M moves counterclockwise in what is approximately a circle.
$684$LW,GI$