194 Account of a Patent Tump. 



the lower valve B may have its foekets formed in the ffanclie 

 at the lower end of the working barrel, and therefore re- 

 quiring no box. The outer valve is alfo conllrucled in the 

 lame manner. 



The pi (Ion fc, being raffed in the working barrel D by any 

 of the methods praclifed with the common pump, rarefies the 

 fnaee between the pi lion and the valve B, which valve opens 

 upwards; tbe exterior atmofphere, at the fame time, by its 

 prewire on the furface of the water in the well, forcing the 

 water to atlend in the fuclion-piccc A, to rellore an equili- 

 brium. On The return of the pifton, the valve B, by its own 

 grayity and the inereafed weight brought upon its upper fur- 

 face, elofes the upper orifice of A ; while the valve C, by the 

 fame inereafed weight acting on its inner furface, is forced 

 out towards b, allowing whatever is contained between the 

 valve B and the piilon E to pafs into the fpout G, from 

 whence it cannot return into the working barrel; for, the 

 moment the pifton begins again to afcend, the valve C, by 

 its own gravity and by the preffure of the atmofphere, is 

 forced back into its firit pofition, and fhuts up the commu- 

 nication between the fpout and the working barrel. A few 

 itrokes of the piilon exhauft the fii&ion-piece A of all the air 

 it contains, driving it off through the valve C; the water, in 

 the mean time, riling in A till it pafs the valve B, and, by 

 fucceilive itrokes, be difeharged through the fpout G. 



It will be readily perceived that this pump, fo far as we 

 have defcribed it, agrees exactly with the common fuclkn- 

 'pump as to its prime principle, the water being raifed to the 

 height at which it is delivered by tbe preffure of the atnjo- 

 Jpbcre alone; hut that it poUetVes alfo important advantages 

 in point of conft ruction. In fh.ort, it has all the denrable 

 properties of the common pump without any of its difad- 

 vantages, betides poffemng not a few good qualities which 

 are peculiarly its own. 



The principal object of its invention was to remove the 

 imperfection of choking ; and in attaining this important end, 

 a variety of collateral advantages have alfo been produced, 

 which enhance its utility. 



. The points in which it differs eficntially from the common 

 pump, znd by which it excels, are,, that it difcharges the 

 water below the pifon ? and has its valves, which are of ibi 

 mojl jimplc and durable conf.ru tiion, h'h:g near each other, 

 and of eajy acctf, witboiti tkedisju any part of the. 



machine. 



The advantages of this arrangement are: that the fand, 

 or other matter which may be in the water, is difeharged 



without 



