cific 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 in entering through it passes through a layer of sponge us to be one of the most important… … mond for that purpose. Patented Dec. 29, 1868. For further which absorbs any foul gases present in it, and finally enters been turned out weekly. The processes of tinning and " gal- particulars address Messrs. J. Kussell & Co., 83 Beekman street, the room through a finely perforated screen which…
Patents · Iron · Zirconia · Velocity · Steel · Steel rails · Water · Tensile strength · Scientific American · Railway car · Wrought iron · Antedated june · Water wheels · Patent office · Cast Iron · Heated air
Internet Archive · Public domain (published before 1931). Free to use for anything.
