calibrated spring

The gyro and gimbal rotate (around the roll axis) with limited freedom against a calibrated spring.

A calibrated dial with a calibrated spring attached to it was used to apply a restoring torque to equal that of the torque applied by the unknown weight.

This device looks like a slide rule, but uses a triangular calibrated spring as a computing element which eliminates all conversions and scaling from numerics to graphics and curves.

Most Brookfield viscometers move a disk or bob spindle immersed in test fluid through a calibrated spring and the spring deflection measures the viscous drag of the fluid against the spindle.