AMERICAN INSTITUTE. 



159 



drical tnl)e, or an equivalent thereto; the bore of which, for the 

 passage of water, is provided with a cup of leather or other 

 equivalent substance, secm-ed and held at or about the centre of 

 the said tube, so that when spread out by the preponderance of 

 the pressure in the air vessel above it, shall be brought in contact 

 all around with the bore of the tube, and thus close the passage 

 to the driving cliand^cr; and wdien contracted by the preponde- 

 rance of the pressure in the driving chamber, it shall open the said 

 tube for the direct passage of water from the driving chamber to 

 tlie air vessel. 



There is now applied a new mode of regulating the outer valve, 

 in place of nuts and screws, which are lialde to unscrew by the 

 jarring movement of tlie ram, and has ever been a source of annoy- 

 ance, ]3y means of a lever and screw, as is shown in tlie vertical 

 sectional view. 



The annexed statistical table of facts, is derived from the opera- 

 tion of my number two sized ram, now at the subscril)er's place 

 of business, and visible every day; the said apparatus is supplied 

 by a one inch drive pipe, thirteen feet long, arranged for all the 

 different elevations stated. The various sizes i")erlbrm the same 

 proportionate functions. Each larger size will raise more than 

 double the quantity of water in a given time. 



