Torsion balance

Torsion balance, device for measuring the force of a twisting motion. These measurements are registered on a gauge that is calibrated—readings adjusted for correct measurement. In a torsion bar, stretched fibers (usually gold, quartz, or steel) are attached to heavy noncorrosive balls (usually gold, lead, or stainless steel) that twist and turn to compensate for the introduced push-and-pull actions. A balanced zero reading is the desired result. In automobiles, a torsion bar, through torsion balance, compensates for bumps and holes experienced on the road.