Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 80
watthours. The construction is simple, the principle is,broadly, that of the Siemens Dynamo-Meter, which iscomposed of a stationary coil of copper wire in serieswith the load and surrounding this coil there is suspendedanother at right angles to the first coil and this outsidecoil is connected in… … Fig. 34 the movable coil is not held to zero position, but revolvesbetween two fixed coils. The movable coil is really asmall drum-wound armature provided with a small com-mutator made of silver to prevent oxidization. The effectof using the commutator is to make the effective plane ofthe moving…
Motion picture theaters · Electric lighting
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