File:PSM V45 D228 Image at the focus of a lens.jpg

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Description Image at the focus of a lens
Date
Source Popular Science Monthly Volume 45
Author Unknown authorUnknown author
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Extracted image from book, to grayscale, cropped whitespace. Modifications made by Ineuw. The original can be found here: Popular Science Monthly Volume 45.

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current10:39, 18 February 2011Thumbnail for version as of 10:39, 18 February 20111,739 × 1,730 (214 KB)Ineuw{{Information |Description = Image at the focus of a lens |Source = [http://www.archive.org/details/popularsciencemo45newy Popular Science Monthly Volume 45] |Date = 1894 |Author = Unknown |Permission = {{PD-old}} |o

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