The lengths of the links comply with the conditions: A͞C=b, G͞F=E͞H, G͞H=F͞E, E͞B:B͞H=E͞D:H͞C and E͞DxH͞C=E͞BxB͞H=b². Figure GFEH is a crossed-crank linkage. Link 1, turning about fixed axis A, is connected by turning pair C to slider 3 which moves along cross-piece Bd of slider 4. Slider 4 moves along fixed guides p-p whose axis is parallel to axis 0x, and cross-piece Bd of slider 4 has its axis parallel to axis 0y. Link 5 is connected by turning pairs E, B and H to link 2, slider 4 and link 6. Link 6 is connected by turning pairs C and G to slider 3 and link 7 which, in turn, is connected by turning pair F to link 2. When link 1 turns about axis A, point D of link 2 describes an apienna with the equation y²(x-b)²-2b³y+b⁴=0 where b is a constant dimension of the mechanism.
$1214$LG,Ge$