Inside Out Library · Explore
Scientific American, Vol. 63, No. 25 (1890) (1890)
leaf 3
ure than usual, by direct hot water radiation in all the rooms. This with a corresponding freedom from leakage and loss of combination insures a circulation of fresh warm air time in stopping for repairs. They make hydraulic throughout a building, and, when proper air exits are presses with from… … the outside through the cold air duct, Y, at the bot- securethe reception of the papers without interruption tom, whence it passes upward around the furnace, in- DAMPER REGULATOR. by the subscriber. © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 63, No. 25 (1890)
More like this
