The lengths of the links of four-bar linkage ABCD comply with the conditions: B͞C=1.92A͞B, C͞E=2.92A͞B, C͞D=2A͞B, A͞D=2.3A͞B and D͞F=2.87A͞B. 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 on straight line DF.
$666$LW,GI$