The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞D=3.64A͞B, B͞C=1.54A͞B, D͞C=18.2A͞B, C͞E=3.72A͞B, B͞E=2.27A͞B and A͞F= 1.27A͞B. When link 1 turns about fixed axis A, point E of link 2 describes a path of which a certain portion approximates straight line q-q, passing through point F.
$669$LW,GI$