In just two minutes, a film record of a circuit breaker's performance under short-circuit test is available. That's how long it takes to remove an exposed film from a cathode-ray oscillograph near the test cell, dispatch it by pneumatic tube to the dark room, develop and display it for engineers to study on illuminated reading tables outside the darkroom. Here a technician in the darkroom of the General Electric Company's new Switchgear Development Laboratory in Philadelphia, PA., inspects a film after removing it from hypo

General Electric Company