The lengths of the links of slider-crank linkage ABC comply with the conditions: B͞C=1.48A͞B, B͞D=2.28A͞B, C͞D=3.62A͞B and A͞E=1.38A͞B. When crank 1 turns about fixed axis A, point D of connecting rod 2 describes a path of which a certain portion approximates straight line q-q, passing through point E. Point E lies on axis Ax of motion of slider 3.
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