File:NIE 1905 Telegraph - polarized relay - diagram.jpg

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Description	English: Diagram to illustrate the operation of a polarized telegraph relay: n s is a hard steel permanent magnet, whose south end, s, has a slit in which the soft iron armature a is pivoted. To this armature a thin aluminum tongue, b, is attached, which by making contacts on either side completes either of two local circuits, and operates either of two sounders, according to which side the tongue is attracted. The coils on the magnet are so connected that a positive current attracts the tongue to one side, while a negative current attracts it to the other.
Date	published 1905
Source	“Telegraph,” The New International Encyclopædia, v. 19, 1905, p. 95.
Author	unknown author

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:16, 17 August 2017		565 × 338 (35 KB)	Bob Burkhardt (talk \| contribs)	{{Information \|Description ={{en\|1=Diagram to illustrate the operation of a polarized telegraph relay: ''n s'' is a hard steel permanent magnet, whose south end, ''s'', has a slit in which the soft iron armature ''a'' is pivoted. To this armature...

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