Telharmonium - Scientific American 1907 (zoomed 400%, brightened).jpg
Telharmonium - Scientific American 1907.png
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: converted to JPEG for sharper appearance, zoomed 400%, and improved contrast.. The original can be viewed here: Telharmonium - Scientific American 1907.png: . Modifications made by
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