File:Telephones and telegraphs- 1902 - (and Municipal electric fire alarm and police patrol systems) (1906) (14753942814).jpg

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English:

Identifier: cu31924022817674 (find matches)
Title: Telephones and telegraphs: 1902 : (and Municipal electric fire alarm and police patrol systems)
Year: 1906 (1900s)
Authors: United States. Bureau of the Census Steuart, William Mott, 1861- Martin, Thomas Commerford, 1856-1924 Abbott, Arthur Vaughan, 1854- Mayer, William
Subjects: Telephone Telegraph Fire alarms
Publisher: Washington : Govt. Print. Off.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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FIG. 3.—MAGNETO BELL.
Text Appearing After Image:
FIG. 4. —MAGNETO GENERATOR ASSEMBLED. FIG. 5. —MAGNETO GENERATOR DISSECTED. APPARATUS OF THE SUBSTATION. 37 the series method in electric Ughting with arc lampsand the multiple or parallel method of lighting withincandescent lamps. The older, or series, type oftelephone is usually provided with a bell of compara-tively low resistance—that is, 60 to 80 ohms—and amagneto generator having its armature normallyshunted when not in use for ring signaling. Withthe best arrangement of this type it is impracticableto place a large number of instruments in series andsecure satisfactory transmission, because of the atten-uation of the current in passing through so manymechanisms. The instruments of the bridging typeare so adapted that they can be placed in multiple orbridging relationship with the line, and now they arecommonly so placed for party lines having more thanone substation. The illustration (Fig. 1) facing page26 shows a bridging set with local battery transmission. The bridgi

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27 July 2014

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current09:14, 17 December 2018Thumbnail for version as of 09:14, 17 December 20182,468 × 3,347 (657 KB)Faebot (talk | contribs)Uncrop
18:01, 17 September 2015Thumbnail for version as of 18:01, 17 September 20151,988 × 724 (430 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': cu31924022817674 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcu31924022817674%2F f...

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