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Scientific American, Vol. 44, No. 16 (1881) (1881)
leaf 7
sistance opposed to it by the air during its and others whose duties take them over the track for various chamber is forced to traverse a layer of air-purifying ma- oscillation. purposes. In fact the velocipede shown in the engraving is terial, which filters out everything objectionable, and leaves… … by addressing Messrs. George 8. Shef- ing and thinning out all kinds of root field & Co., Three Rivers, Mich. plants. © 1881 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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