Lever 1 turns about fixed axis A. At point B, link 2 with weight d is suspended from lever 1. At point E, the force F to be measured is applied to lever 1. Force F turns lever 1 about axis A, lifting counterbalancing weight d which is immersed in a vessel with water. The force F is proportional to the height a that the weight is raised. Force F is indicated on scale c. Before the test, the hand is zeroed by means of weight 3.
$3928$LHP,M$