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MULTIPLE-BAR PLATFORM SCALES

The basic mechanism of the scales is four-bar linkage ABCD, to whose links, 1 and 2, platform 3 is connected by turning pairs. Link 2 turns through a small angle within the limits permitted by stops a. Since it is a kinematically rigid system, lever 2 can turn due to the small clearances in the hinge joints.
$793$LW,B$