126 FARM MECHANICS 



horsepower engine will do. This statement may not 

 hold good when figured in fractions, but it will in farm 

 practice. Also when running a pump or cream sepa- 

 tor the engine is capable of doing a little extra work 

 so that the storage batteries may be charged with very 

 little extra expense. 



On one dairy farm a five-horsepower kerosene engine 

 is used to furnish power for various farm purposes. 

 The engine is belted to a direct-current generator of 

 the shunt-wound type. The generator is wired to an 

 electric storage battery of 88 ampere hour capacity. 

 The battery is composed of a number of separate cells. 

 The cells are grouped together in jars. These jars con- 

 tain the working parts of the batteries. As each jar 

 of the battery is complete in itself, any one jar may be 

 cut out or another added without affecting the other 

 units. The switchboard receives current either from 

 the battery or from the engine and generator direct. 

 There are a number of switches attached to the switch- 

 board, which may be manipulated to turn the current 

 in any direction desired. 



Some provision should be made for the renewal of 

 electric lamps. Old lamps give less light than new 

 ones, and the manufacturers should meet customers on 

 some kind of a fair exchange basis. Tungsten lamps 

 are giving good satisfaction for farm use. These 

 lamps are economical of current, which means a reduc- 

 tion of power to supply the same amount of light. The 

 Mazda lamp is another valuable addition to the list of 

 electric lamps. 



The Wisconsin Agriculturist publishes a list of 104 

 different uses for electricity on farms. Many of the 

 electrical machines are used for special detail work 

 in dairies where cheese or butter 'is made in quantity. 



