Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 81
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 ELECTRICITY 75 The connections of the recording watt hour meter aremade on the same principle as those of the indicating wattmeter illustrated in Fig. 34. The fixed coils are in serieswith the circuit and the movable coil and a small resist-ance in series with it are in parallel with…
Motion picture theaters · Electric lighting
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-63-19.webp)
