ENGINES, MOTORS AND TRACTORS 755 



water to the rotary part under the proper direction and with the proper 

 speed. 



A revolving portion which consists of veins or buckets which are 

 placed in a certain position around the axis of the motor. 



The last two mentioned are the most efficient and up-to-date water 

 motors on the market. Power obtained in this method is dependable, 

 inexpensive, safe and sanitary. 



The Hydraulic Ram. — This device, although very wasteful of water, 

 is -one of the most economical motors for pumping water. It serves both 

 as a motor and a pump. It is not only used for furnishing water for the 

 farm house, barn and dairy, but it is used in many cases for irrigation 

 purposes. Only about one-tenth of the water passing through a ram 



Hackney Auto-plow. 1 



is finally delivered to the water tank. There is a ram on the market 

 at present which will operate on impure water which may be secured 

 in large quantities and made to pump a pure supply of water. This is 

 commonly known as the double-acting ram. 



THE FARM TRACTOR 



Farm tractors have been placed upon the market in the past in such 

 large units that they were practical only on extremely large level farms 

 in the Middle West. This type of tractor is being driven from the field 

 by smaller and more compact tractors which are finding a place also on 

 the small farm of 160 acres or less. 



The Size of Tractors. — A tractor of less than five tractive and ten- 



1 Courtesy of Hackney Manufacturing Company, St. Paul, Minn. 



