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ex magnet system, Electrical measurementsA laboratory manual . Fig. 70. ing between the rods and the case can be by MEASUREMENT OF CURRENT. 147 rubber washers when the is not in use., Motion picture electricity. all direct-currentgenerator usually called the exciter is supplied to thebrushes, allowing the direct to flow from thecollector rings, through the magnet coils on the rotatingpoles, which are