File:Benham harmonograph.png
Benham_harmonograph.png (237 × 481 pixels, file size: 34 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:18, 23 November 2011 | 237 × 481 (34 KB) | SreeBot | (Original text) : Source: http://www.1920-30.com/toys/things-to-make/harmonographs.html Details to follow shortly. {{PD-1923}} |
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