The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞B=D͞C=A͞D=4C͞B and C͞E=E͞B=0.53B͞C. 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, parallel to AD.
$655$LW,GI$