WINDMILLS AND PUMPS. 



373 



of the south. There are two kinds shown in Figs. 83 

 and 84. The one shown in Fig. 83 is the Huffer patent 

 and is calculated to lift water twenty feet or less and 

 discharge it at the pump on the surface of the ground. 

 The other is the Rogers patent and is made for deep 

 wells — not to exceed one hundred feet, however. It 

 has a stand-pipe for taking 

 the water at the pump, which 

 is set in the well just above 

 the water-line, and carrying 

 to the surface, where it is dis- 

 charged. The mechanism is 

 simple, consisting of two ver-, 

 tical cylinders attached to a 

 single su<5lion-pipe below and 

 conne(5led above by a sliding 

 steam-valve contrived for au- 

 tomatic movement, allowing 

 steam to enter the cylinders 

 alternately, where it is con- 

 densed, creating a vacuum 

 into which the water rises by the pressure of the 

 atmosphere, escaping from one cylinder while the 

 other is filling, thus giving a continuous flow varying 

 from fifty to three thousand gallons a minute, or a 

 three hundred and thirty inch stream under a four- inch 

 head for the largest sized pump. Other forms of 

 vacuum pumps are the Pulsonieter, Nye and Swan, the 

 latter, however, working by steam and hot air com- 

 bined, requiring high-pressure boilers and an air con- 

 denser, and making in all a rather expensive plant. 

 We are not exactly satisfied thus far with the operation 



FIG. 84 — HIGH-LIFT 

 VACUUM PUMP. 



