3l6 FARM MOTORS 



The windmill without doubt is the best machine for 

 this, but since we cannot depend on the wind at all hours 

 of the day, we must devise some scheme whereby we 

 can store the work when the wind blows so that we may 

 use it when there is no wind. For this means four ways 

 come to mind : One is to connect a dynamo to the mill 

 and store the electricity in storage batteries. This is not 

 a feasible plan at present, since the expense of storage 

 batteries and the cost of repairs is too great. Another 

 plan is to run an air compressor by means of the wind 

 and then use the compressed air for power purposes. 

 This again is not satisfactory owing to the cost of keep- 

 ing air machines in repair and also of conveying the air. 

 Another scheme, and probably the best, is to pump water 

 into a tank on a tower, and then let this.water which 

 has been stored up during the time of wind run down 

 through a water motor arid from thence to the yards, or, 

 if there is more water than is desired for the stock and 

 house use^ run it into another tank below the tower and 

 then pump it back. Another scheme which is similar to 

 that named last is to pump the water into a pressure tank 

 in the cellar and then let it pass out the same as in the 

 tank on the tower. By this latter scheme the ex- 

 pense of the tower and the danger of freezing are obvi- 

 ated, but a more expensive tank and also an air pump are 

 added. 



437. Power mills. The same discussion, which has 

 been given more especially to pump mills, will apply to 

 power mills. As a rule, power mills are larger than pump 

 mills, and require more skill in keeping the bearings in 

 repair. Care should be taken in erecting power mills that 

 the shaft is in perfect alignment. A great deal of power 

 can be lost by not having the shaft running in a perfect 

 ling. 



