be discharged out of doors, is a candle, the flame of which is deflected inward, showing the current of air. Although the air in the rooms changes completely in from four to six minutes, there is no draft to be felt at any time or in any place. The air flows, rather than blows. The air is propelled… … Plan and Elevation of the Basement, Air Duct, and Air Shalt. section through the house and shaft reach- First Floor Flan, Showing Air Shafts. ing to the cave. These show the simple yet highly effective means employed to control the caves, 87 at 54 deg., reduces itself to 70 when the tem- they all…
Machine · Air · Buy · Engine · Tie plate · Scientific American · Pattern plates · Gas engine · American supplement · Position finders · Chain track · Philo system · Spray cap · Washing machine
Internet Archive · Public domain (published before 1931). Free to use for anything.
