File:PSM V19 D202 Sound transmission with lampblack reflector.jpg
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DescriptionPSM V19 D202 Sound transmission with lampblack reflector.jpg | Sound transmission with lampblack reflector | |||||
Date | ||||||
Source | Popular Science Monthly Volume 19 | |||||
Author | Unknown authorUnknown author | |||||
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current | 02:55, 21 March 2014 | 3,366 × 1,208 (257 KB) | Ineuw (talk | contribs) | Cleaned image & improved contrast | |
02:49, 21 August 2010 | 3,414 × 1,247 (291 KB) | Ineuw (talk | contribs) | {{Information |Description = Sound transmission with lampblack reflector |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_19.djvu/202 |Date = 1881 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Categor |
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