The lengths of the links comply with the conditions: A͞F=A͞D, B͞K=K͞E and E͞‘F=F͞K‘=K͞‘D=D͞E‘. When crank 1 turns about fixed axis C, point K provides for image distortion in the vertical direction with a distortion factor equal to a=A͞B/A͞F=A͞E/A͞D=B͞K/F͞K‘=E͞K/D͞K‘. There is no distortion along axis AC. To reproduce an isometric representation, point K' is traced around the required contour. Then, shifting the drawing with the distorted contour to one side, the required supplementary details are added. If a=1/sqrt(3) we obtain an isometric projection.
$768$LW,Ge$