File:PSM V39 D762 Elevation of an open hearth furnace.jpg
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DescriptionPSM V39 D762 Elevation of an open hearth furnace.jpg | Elevation of an open hearth furnace | |||||
Date | ||||||
Source | http://en.wikisource.org /wiki/Page:Popular_Science_Monthly_Volume_39.djvu/762 | |||||
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 greyscale, cropped whitespace. The original can be viewed here: Popular Science Monthly Volume 39.djvu: . Modifications made by Ineuw.
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current | 19:50, 18 October 2015 | 1,512 × 631 (240 KB) | Ineuw (talk | contribs) | Cleaned image and improved contrast | |
21:54, 27 November 2010 | 1,527 × 639 (277 KB) | Ineuw (talk | contribs) | {{Information |Description = Elevation of an open hearth furnace |Source = http://en.wikisource.org /wiki/Page:Popular_Science_Monthly_Volume_39.djvu/762 |Date = 1891 |Author = Unknown |Permission = {{PD-old}} |other |
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