File:PSM V23 D638 Sectional view of house heating by hot air circulation.jpg

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Description Sectional view of house heating by hot air circulation
Date
Source Popular Science Monthly Volume 23
Author Unknown authorUnknown author
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current16:14, 30 August 2010Thumbnail for version as of 16:14, 30 August 20101,671 × 1,816 (397 KB)Ineuw{{Information |Description = Sectional view of house heating by hot air circulation |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_23.djvu/638 |Date = 1883 |Author = Unknown |Permission = {{PD-old}} |other_versions = }}

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