The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞B=B͞E=B͞C, A͞D=2.15A͞B, C͞E=2A͞B and D͞C=1.3A͞B. 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 A.
$672$LW,GI$