ATMOSPHERIC PUMPS.
The Bliss-Heath Atmospheric Pumping Engine represented by Fig. [455] is novel in its construction, consisting of a low-pressure, upright, tubular steam boiler, having a safety valve loaded to carry 11⁄2 lbs. steam pressure. The large cover lifts under 2 lbs. pressure, hence explosions cannot occur.
Fig. 455.
Note.—The safety valve is shown on the floor alongside of the hand bar arranged to work the feed pump. Fig. 455.
The motor is a simple atmospheric engine operating a plunger pump and a single acting air pump.
The operation of this motor is almost noiseless.
The motive power is the normal pressure of the atmosphere (14.7 lbs. to the square inch), utilized by the formation of a vacuum in the power cylinder.