The lengths of the links comply with the conditions: B͞D=C͞F, E͞D=H͞F and E͞H=D͞F=B͞C. The mechanism is based on a translator consisting of parallel-crank linkages BDFC and DEHF. Links 3 and 7 turn about fixed axes B and C. When link 1 turns about fixed axis A, link 4 has translational motion and all of its points describe circles of radius A͞E.
$724$LW,GI$