AMERICAN INSTITUTE. 155 



inclined plane in case D, to passage E, and thence to the point of 

 delivery, a vacuum being thereby created between the wings, 

 causes the water to rise through pipe B, to keep up the supply. 

 Ey means of the spiral passages formed by hub L and its wings, 

 tlie water from pipe B is gradually turned from a vertical to a 

 nearly horizontal course, and delivered to the i)ropelling wings 

 in the line of their action, thence through the spiral passage E, 

 it is again, l^y an easy, gradual curve, brought back to a straight 

 course upon reaching the outlet e. The wings upon disc K pass- 

 ing above its upper edge, create and maintain a vacuum between 

 it and case D, and prevent sand, dirt, &c.,froni coming in contact 

 with tlie shaft. Step N is in like manner protected from dirt, 

 enabling the pump constantly to discharge a large proportion of 

 sand, gravel, &c., without injury to any of its })arts. 



There being no valves in action, (the foot valve remaining open 

 while the pump is in motion, and used only to retaiii the cliarge 

 while the pump is at rest,) and no wx-aring parts, except the shaft 

 in its bearings, the friction is reduced to the smallest jiossible 

 fraction, enabling a pump to run for years without rej^airs. A 

 large percentage of power lost in piston pumps in overcoming 

 the momentum and inertia at each stroke is saved by this pump; 

 also the power lost in other centrifugal pumps in moving the 

 water at right angles, as by this construction all changes of direc- 

 tion are made by easy curves, enabling the pump to do the same 

 w^ork at a much lower velocity, and consequent expenditure of 

 power. It works equally w^ell as a suction or force pump. 



[Ji large silver medal awarded. 



Carr''s Kew Cut-off for Kitchen Boilers. 

 Sawyer & Carr, 3 Bedford street. New- York. 



The object of this inven- 



tion is to prevent water 

 in tanks or reservoirs, 



;^8 (located in altic stories 



1 for supplj'ing upper 



[}—''-:^dMmk P'^i"^^ *'f houses,) fi-om 



being drawn o if for 



