File:The principles underlying radio communication (1922) (14735064496).jpg

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Description
English:

Identifier: principlesunderl00unit (find matches)
Title: The principles underlying radio communication
Year: 1922 (1920s)
Authors: United States. National Bureau of Standards Ould, Richard Sheldon, 1889- United States. Army. Signal Corps
Subjects: Telegraph, Wireless Radio
Publisher: Washington, Govt. Print. Off.
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

View Book Page: Book Viewer
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Text Appearing Before Image:
Fia. 113. Scheme oj -4 - t^o!e-2j^*^^ 1 *■ ~ Loo. - Fi<sl<J bol«5 the brushes, which are thus seen to be alternately, one positiveand the next negative, as we go around the commutator. Ifa machine having more than two sets of brushes is examined,it will be found that all the positive brushes are joined by aheavy conductor and all the negative brushes by another. Thenone connection is made from the group of positive brushes to the external circuit, and one from all the negative bnishes. In speaking of alternators, the actual construction of arma-tures was described; that is, the use of machine-wound coils inslots in the face of a laminated core. D.c. armatures are made 10 See section 63, p. 153.
Text Appearing After Image:
Fig. 114 (upper)—Method of assembling commutator segments. Fig.115 (middle)—Commutator and armature core assembled showingrisers. Fig. 116 (lower)—Armature complete with windings con-nected to risers. 183 184 DYNAMO-ELECTRIC MACHINERY. the same way except that the ends of the coils are soldered to the commutator segments. The main steps are shown in Figs. 114, 115, and 116. Thefirst shows the copper segments, with their sheets of mica be-tween them, assembled in the form of a ring and held togetherby a firm temporary clamp. The next picture shows the com-mutator fastened on the front end of the armature core. The* risers are to be seen coming up from the ends of the seg-ments for connection to the armature coils. On the core, builtup of thin laminations, note the teeth, slots, and three rows ofair ducts for ventilation. The last picture shows the coils inthe slots of the core. Their ends have been soldered to thecommutator. 88. Excitation: Separate, Series, Shunt, Compound.—Whi

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Flickr tags
InfoField
  • bookid:principlesunderl00unit
  • bookyear:1922
  • bookdecade:1920
  • bookcentury:1900
  • bookauthor:United_States__National_Bureau_of_Standards
  • bookauthor:Ould__Richard_Sheldon__1889_
  • bookauthor:United_States__Army__Signal_Corps
  • booksubject:Telegraph__Wireless
  • booksubject:Radio
  • bookpublisher:Washington__Govt__Print__Off_
  • bookcontributor:Internet_Archive
  • booksponsor:Internet_Archive
  • bookleafnumber:186
  • bookcollection:internetarchivebooks
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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