The lengths of the links comply with the conditions: A͞B=C͞F=C͞E, B͞D=D͞E=4.27A͞B and A͞C=4.52A͞B. Link 1 turns about fixed axis A and is connected by turning pair B to links 2 and 5. Link 4 is connected by turning pair D to link 5 and by turning pair E to link 3 which turns about fixed axis C. Link 2 is connected by turning pair F to link 3. When link 1 turns about axis A, point D describes a path of which a certain portion approximates straight line q-q.
$696$LW,GI$