The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞D= 1.65A͞B, B͞C=D͞C=0.65A͞B, C͞E=0.95A͞B, B͞E=0.35A͞B and A͞F=0.7A͞B. 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.
$673$LW,GI$