Circuits were closed with jaw switches and opened by arc-light plugs. ... more without a stop. ... The alternating plant might have suffered a similar fate, had it not been for its aTaquot;tootlied armattires and replaceable coils, eight of which were successively burned ... When repaired these also were immersed in engine oil, and gave no further trouble during the three years they remained in service. ... It was a rule that every attendant keep one hand in his pocket while w0rking_with the other.