File:PSM V33 D099 Sound source located by resonator triangulation.jpg
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current | 04:37, 29 September 2010 | 905 × 633 (22 KB) | Ineuw | {{Information |Description = Sound source located by resonator triangulation |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_33.djvu/99 |Date = 1887-1888 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [ |
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