The lengths of the links of link- gear mechanism ABC comply with the conditions: A͞C=1.81A͞B and B͞D=1.64A͞B. When crank 1 turns about fixed axis A, point D of 1 ink 2 describes a path of which a certain portion approximates straight line q-q which is perpendicular to the line of centres AC.
$1356$LG,GI$