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Scientific American, Vol. 57, No. 6 (1887) (1887)
leaf 3
to the purity of the water, and The fire escape illustrated herewith, which has been any scum floating on the surface of the water is dis- patented by Mr. Henry Opp, of Belleville, Ill., embodies charged in like manner from blow-off cocks arranged a combination of valuable features, including an… … per:y made, is said to. be very fine. © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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