 This system used precision electrical contacts to actuate the torque motor and achieved an accuracy of 1 part in 1000 to 1 part per 10000 known in technical parlance as a scale error of 1000 to 100.This was equivalent to about 600m of accuracy over the V2 1500m/s speed and 320km flight.Since the number of shaft rotations represented speed, a Cam Switch was used to initiate missile control sequences such as engine throttle-down and shut-off.