The lengths of the links comply with the condition: E͞D=D͞F=D͞C. Link 1 rotates about fixed axis A and is connected by turning pair B to link 2 which, in turn, is connected by turning pair C to link 3. Link 3 is connected by turning pairs D and F to link 4 and slider 5. Link 4 turns about fixed axis E, and slider 5 moves in fixed guides p-p. When link 1 rotates about axis A, point C describes a straight line.
$1556$SC,GI$