File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14756217252).jpg

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Description
English:

Identifier: electricalinstru00unitrich (find matches)
Title: Electrical instruments and telephones of the U.S. Signal corps
Year: 1911 (1910s)
Authors: United States. Army. Signal Corps
Subjects: Military telegraph -- United States Military telephone -- United States
Publisher: Washington, Govt. print. off.
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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Text Appearing Before Image:
e and broken in rapid succession theeffect of the self-induction produces on break a self-induced currentof high E M F. which tends to sustain the original current by passingacross the break (A S) ; and further, that unless some alternate cir- 106 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. euit is furnished a bright spark Avould be noticed between these points.With terminals L G disconnected this induced current charges con-denser C. The condenser immediately discharges back through bat-teiy, //, B^ F, I (condenser circuit bridging break). From this it i^seen that the function of the condenser is to prevent sparking atbreak. The condenser is in series with coil /, the effect of which is toprevent abnormal charging of condenser. AVith terminals L G con-nected to line and ground, respectively, assuming another instrumentproperly connected at distant station, the self-induced discharge fromcoil B has, in addition to the path through condenser, another circuitcalled the secondary circuit.
Text Appearing After Image:
x_, c^ -r- I ,^—O ^^ KlG. O-J. SIXONUARY CIRCUIT, BUZZEK. From /> to //. /. line to distant station return through ground to (?,receiver, (>. thi-ouah cylinder F to /\ to />. TRANSMITTER CIKCUIT. TELKPIIONK. The transmitter switch IF being closed, tlie circuit is as follows:From -;- side to third cell to transmittci- O. through cylinder Fto 1\ B. TL L. to — side of battery. SECONDAUY flRCUlT. TELEPIIONK. The secondary of talking circuit is the same as the secondary ofbuzzer circuit. The utilization of existing telegraph lines as a part or the wholeof a circuit for buzzer and telephone working, at the same time notinterfering with the use of the wire for Morse working, may be ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS, 107 effected by using condensers interposed between the line and thebuzzer. (See fig. 63.) The jDiilsations of the ordinary Morse sending are comparativelyslow. The condensers, therefore, act as a very large resistance, andno appreciable effect will be notice

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Flickr tags
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  • bookid:electricalinstru00unitrich
  • bookyear:1911
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:United_States__Army__Signal_Corps
  • booksubject:Military_telegraph____United_States
  • booksubject:Military_telephone____United_States
  • bookpublisher:Washington__Govt__print__off_
  • bookcontributor:University_of_California_Libraries
  • booksponsor:MSN
  • bookleafnumber:109
  • bookcollection:cdl
  • bookcollection:americana
Flickr posted date
InfoField
27 July 2014

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