The lengths of the links of four-bar linkage ACBE comply with the conditions: C͞B=B͞E=B͞D=2.5A͞C and A͞E=2A͞C. When link 1 rotates about fixed axis A, point D of link 2 describes path q-q. Upon motion of point C along arc a-d-b, point D travels along approximately straight line a₁-d₁-b₁.
$651$LW,GI