A corner of the Metro substation, showing at left the big 300 kilowatt motor-generator set that takes the incoming alternating or "flickering" current and gives out the direct or "steady" current required for lights at the camera level. At right is the balancer set furnishing the neutral, or compensating member of the generating system. Part of the metro switchboard is visible in the background. These machines work to remove the flicker from the film.
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