File:PSM V03 D418 Single needle instrument.jpg

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Description Cooke and Wheatstone's single needle telegraph.
Date between 1872 and 1873
date QS:P,+1872-00-00T00:00:00Z/8,P1319,+1872-00-00T00:00:00Z/9,P1326,+1873-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 3
Author Unknown authorUnknown author
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current19:06, 26 June 2010Thumbnail for version as of 19:06, 26 June 20101,623 × 1,334 (251 KB)Ineuw{{Information |Description = Single needle instrument |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_3.djvu/418 |Date = 1872-1873 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} {{GFDL-user-w|en|Wikisour

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