You searched for: “torsion balances”
torsion balance (s) (noun), torsion balances (pl)
A device designed to measure weak gravitational, electrostatic, or magnetic forces by determining the amount of torsion that they cause in a wire or filament.
This entry is located in the following units: libra-, liber-, libri- (page 2) tors-, tort-, -tort, tortu-, torqu- (page 3)