File:PSM V37 D182 The four stages of etching from right to left.jpg

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Description The four stages of etching from right to left
Date
Source Popular Science Monthly Volume 37
Author Unknown authorUnknown author
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Date/TimeThumbnailDimensionsUserComment
current07:01, 24 June 2015Thumbnail for version as of 07:01, 24 June 20152,025 × 1,451 (1.06 MB)IneuwCleaned image and improved contrast
22:59, 22 October 2010Thumbnail for version as of 22:59, 22 October 20102,049 × 1,464 (898 KB)Ineuw{{Information |Description = The four stages of etching from right to left |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_37.djvu/182 |Date = 1890 |Author = Unknown |Permission = {{PD-old}