The lengths of the links of slider-crank linkage ABC comply with the conditions: B͞C=0.36A͞C and C͞D=0.125A͞C. When link 1 turns about fixed axis A, point D of connecting rod 2 describes path q-q which approximates a straight line over the portion corresponding to the turning of link 1 through an angle α≈25°.
$1537$SC,GI$