274 



FARM MACHINERY 



rams may be used in batteries. To replenish the air in 

 the air chamber, a snifting valve is placed on the drive 

 pipe. In freezing weather it is necessary to protect the 

 ram by housing, and often artificial heat must be supplied. 

 389. Water storage. Owing to the fact that water 

 must in nearly all cases be pumped at certain times which 



FIG. 196 HYDRAULIC RAM IN OUTLINE 



may vary greatly in the intervals between each other, 

 some form of water storage must be had in order to 

 secure at all times an adequate supply to meet the con- 

 stant needs. It is not only necessary to have a supply 

 to furnish water for stock and household needs, but also 

 for fire protection. 



390. Amount of water needed. The amount of water 

 required for household purposes with modern conven- 

 iences has been found to be about 20 gallons a person, 

 large or small. A horse will drink about 7 gallons a 

 day and a cow 5 to 6 gallons. From this data the amount 

 of water used a day may be estimated. If a windmill is 



