F. H. Richardson's bluebook of projection (1935)

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DRIVES 603 to touch the adjustable contact immediately in front of it. Closing this contact (Figure 146) short-circuits a Fl ELD RHEOSTAT ARMATURE PI ELD COIL : BRUSHES ADJUSTABLE CONTACT BRUSH v FIELD (CENTRIFUGAL \SUP -COIL DEVICE RING Fig. 146. — Electrical diagram of centrifugal speed control system. resistance in the motor field line, increasing the current to the motor field.