File:PSM V17 D022 Speaker design by philip reis 1861.jpg

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Description Speaker design by Philip Reis 1861
Date
Source Popular Science Monthly Volume 17
Author Unknown authorUnknown author
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Date/TimeThumbnailDimensionsUserComment
current03:45, 20 February 2014Thumbnail for version as of 03:45, 20 February 20141,354 × 2,089 (293 KB)IneuwImproved image contrast
01:34, 28 September 2013Thumbnail for version as of 01:34, 28 September 2013709 × 1,072 (113 KB)Ineuw{{Information |Description = Speaker design by Philip Reis 1861 |Source = [http://www.archive.org/details/popularsciencemo17newy Popular Science Monthly Volume 17] |Date = 1880 |Author = {{unknown|Author}} |Permission = {{PD-old}} |other_versions...
03:38, 16 August 2010Thumbnail for version as of 03:38, 16 August 2010709 × 1,072 (100 KB)Ineuw{{Information |Description = Speaker design by Philip Reis 1861 |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_17.djvu/22 |Date = 1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Popular
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