File:Motion picture electricity (1914) (14780901601).jpg

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English:

Identifier: motionpictureele00hall (find matches)
Title: Motion picture electricity
Year: 1914 (1910s)
Authors: Hallberg, Josef Henrik, 1874-
Subjects: Motion picture theaters Electric lighting
Publisher: New York city, The Moving picture world
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image:
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 coil (armature) take a position at right angleto the plane of the fixed coils. 74 MOTION PICTURE ELECTRICITY
Text Appearing After Image:
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 the circuit asillustrated in Fig. 35. The amount of energy expended in the circuit is meas-ured by the rotation of the movable coil or armature,which rotates and drives a worm on the upper end of thearmature shaft engaging with a set of gears which op-erate a dial similar to a gas meter dial so that the energyexpended in a given time in a circuit may be read di-rectly from the dial in watt hours. The friction of the apparatus being exceedingly smallthe retarding force on the coil that opposes its tendencyto rotate is imparted by a thin copper disk attached to thelower end of the shaft on which the armature is mounted.This disk is rotated between the poles of strong permanentmagnets; the lin

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Flickr tags
InfoField
  • bookid:motionpictureele00hall
  • bookyear:1914
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Hallberg__Josef_Henrik__1874_
  • booksubject:Motion_picture_theaters
  • booksubject:Electric_lighting
  • bookpublisher:New_York_city__The_Moving_picture_world
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:81
  • bookcollection:library_of_congress
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014
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