Beam 3 with a hand and weight a turns about fixed axis A. Beam 4 with a hand and a heavier weight b turns about fixed axis B. Flexible links 5 and 6 run over shaped lugs c and d of beams 3 and 4. The other ends of the flexible links are secured to the shaped ends e and f of freely suspended link 1. Item 2 to be weighed is suspended from the middle of link 1. Until the weight of load 2 reaches a definite value, only beam 3 turns about axis A. When the load exceeds a certain limit, beam 4 also begins to turn about axis B.
$2018$FL,B$