The length of the links comply with the conditions: A͞F=A͞C=K͞L=K͞G, M͞F=M͞C=M͞E=M͞L=M͞G=M͞D and B͞D=B͞C=G͞H=H͞E. Figures AFMC, BDMC, MLKG and MEHG are rhomboid linkages. Points A, B, C, G, H and K lie on single straight line Oa. Axis Ob, perpendicular to straight line Oa and passing through point M, is the axis of mirror symme try of the left and right halves of the mechanism. Link 1 turns about fixed axis A and is connected by turning pair F to link 3. Link 6 turns about fixed axis B and is connected by turning pair D to link 5. Link 4 turns about fixed axis C and is connected by turning pair M to link 3. Links 3, 5 and 7 are connected together by turning pair M and by turning pairs E, L and G to links 8, 9 and 2. Link 2 is connected by turning pairs K and H to links 9 and 8. When link 1 turns about axis A, link 2 has rectilinear translation along line Oa.
$730$LW,GI$