Inside Out Library · Explore
Scientific American, Vol. 40, No. 9 (1879) (1879)
leaf 4
and slamming of doors; it is especially in- on RECENT ENGINEERING PATENTS. are suspended in the cold solution at a suitable degree of tended for doors that are frequently opened and closed, but | A boiler furnace, capable of consuming smoke and gas may also be applied to rolling shutters, hatchway… … being coated with asphaltum, so that the wood G. 8. Perkins, of Hartford, Conn., from whom is not affected by moisture. further information may be obtained. © 1879 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 40, No. 9 (1879)
More like this
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-427-189.webp)
