The lengths of the links comply with the conditions: B͞C=E͞F=G͞F=3.1A͞B, B͞E=3.5A͞B, C͞E=1.9A͞B, D͞C=2.5A͞B, A͞D=3.3A͞B, A͞G=5.8A͞B and D͞G=3.1A͞B. Link 4 is connected by turning pairs E and F to link 2 of four-bar linkage ABCD and to link 3 which oscillates about fixed axis G. When point B of crank 1 travels along the part of the circle indicated by a heavy continuous line, point E of connecting rod 2 describes a path of which portion a-a approximates a circular arc with its centre at point F. During this period link 3 almost ceases to oscillate, i.e. it practically has a dwell.
$750$LW,D$