A moving-film system for recording high rate-of-rise signals

In the process of performing many staged-system tests, some involving short-circuit currents as high as 45,000 amperes and voltages of 230 kv, the Bonneville Power Administration has developed techniques for recording fast-rise voltages and currents associated with such tests. Various recording systems are described. Of particular interest is a high-speed 35-mm moving-film type of camera capable of recording frequencies above 50 kc