The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞B=D͞C, B͞C=0.62A͞B, B͞E=E͞C and A͞D= 2.15A͞B. When link 1 turns about fixed axis A, point E of link 2 describes path q-q of which the portion H is approximately a straight line.
$644$LW,GI$