Diamond / Scheeffer Type D Previous
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This model was an induction type like the previous Type C. The motor was of a radically different design. The stator was formed out of a pair of yokes - the lower one carrying the windings and the upper one serving as a return path for both sets of coils. The voltage coils were wound on the limbs of the lower yoke and the current coil was positioned above and between the voltage coil sections. The light-load adjusters were positioned at both ends of the disk in the gap between the two yokes. The full-load adjustment was two iron pieces on the end of the brake magnet. As with the early GE Thomson Recording Wattmeters, the register was non-direct reading, a multiplier being marked on the register to arrive at the correct reading (one register ratio was used for all except the smallest capacities). The current terminals are at the top and the voltage coil tap is at the bottom right corner of the base. Diamond Type D
Unknown collection