376 



Transactions. — Miscellaneous. 



unnecessary, as from preference another ejector-station would 

 be inserted. From the gravitating pipes or sewers the sewage 

 enters the bottom of the ejector, a spherical cast-iron vessel 

 usually holding 350 gallons, and 5ft. in diameter. In the inlet- 



AVTOMATIC C£Alt 



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FIG. 2. 



pipe is a ball-valve which closes to prevent the return of the 

 sewage. Upon the ejector being full (fig. 2) a bell-float 

 actuates an automatic gun-metal valve placed on the top of 

 the apparatus admitting air under pressure, which at once 

 forces the contents through another ball-valve into the out- 

 fall main or sealed sewer. When the ejector is empty (fig. 

 1) the descending cup actuates the valve, releasing the com- 

 pressed air, upon which the ball-valve in the outlet-pipe closes, 

 while that in the inlet opens, when the sewage enters as be- 

 fore. This action can take place about once a minute, and is 

 perfectly automatic, having been proved to work for several 

 years without attention except an occasional oiling. 



The ejectors are placed below the level of the street and 

 are free from all objection ; while in practice they are pro\dded 



