A torque balance for precision measurements

A TORQUE BALANCE was developed for the purpose of measuring torque-motor stall torques in the range of 0.05 to 100,000 dyne-cm. The torques are measured at various angular positions of the torque-motor rotor with respect to the stator. In this torque range, the primary measurement problem is the friction in the pivots or bearings of the measuring instrument. Of the many pivot types tried, the crossed-reed pivot had the lowest friction level.