WINDMILLS AND PUMPS. 259 



one-seventh of tho water f ami shed to the ram may bo 

 raised to a hight of four times the hight of the supply, 

 one-fourteenth to eight times the hight of the supply, 

 one twenty-eighth to sixteen times the hight of the 

 supply, and so on. The manufacturer of Rife's ram gives 

 the following rule for ascertaining how many gallons 

 my be delivered in an hour. Multiply the number of 

 gallons the ram will receive through the supply pipe a 

 minute, by the feet in fall. Multiply the product by 

 forty, then divide by the number of feet the water is to 

 be elevated above the ram. The result will be the num- 

 ber of gallons delivered in an hour. 



Water Motors. In large streams of steady cur- 

 rent, the Harvey water motor, an outline of which is 



FIG. 80. HARVEY WATER MOTOR. 



given iii Figure 80, is considered quite a success in lifting 

 water for irrigation. By the use of wing dams in the 

 stream the force of the current operates directly upon 

 the wheel at the lower point of the dams, and in this 

 way power is created for running a centrifugal pump. 

 The wheel is a combination of an undershot and breast 

 wheel hung on a swinging frame, and is balanced by a 

 counterweight. Its gearing is a sprocket wheel, so that 

 it can be raised or lowered with the varying rise or fall 

 of the river without any readjustment of gearing. Mr. 

 F. H. Harvey's wheel at Douglas, Wyoming, is ten feet 

 in diameter, fourteen feet long, and secures sixty horse 

 power, operating a 3 1-2 inch pump, which delivers one 



