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Scientific American, Vol. 21, No. 4 (1869) (1869)
leaf 7
nters this ventilator by virtue of the pressure of 4 Snare Tere the external air, the specific gravity of the air inside an occupied and warmed room being less than that outside. Hence it is not subject to being affected by external winds as much as many other kinds cf apparatus. It appears to us… … particulars address Messrs. J. Russel] & Co.,83 Beekman street, 1.¢., zincing, the plates, or other objects, has often New York city, © 1869 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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