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WATT FOUR-BAR APPROXIMATE STRAIGHT-LINE MECHANISM

The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞D=B͞E= 0.68A͞B, D͞C= 0.51A͞B, C͞B=0.49A͞B and C͞E=1.1A͞B. When link 1 turns about fixed axis A, point E of link 2 describes a path of which portion q-q is approximately a straight line.
$645$LW,GI$