The lengths of the links comply with the conditions: D͞E=F͞G=K͞H and D͞F=E͞G=E͞H=D͞K. Thus, the right-and left-hand parts of the mechanism are parallel-crank linkages. Weighing can be done either directly on the pans or by means of supplementary indicating mechanism ABC having hand a and dial scale b.
$784$LW,B$