MILKING MACHINES 283 



valve; and about 150 feet of gas pipes. Each machine 

 milks two cows. 



Cost of Apparatus. The following may be considered 

 an approximate estimate of the cost of a milking outfit 

 for about 30 cows: Two milkers, $180; vacuum pump, 

 $50; vacuum reservoir, including two vacuum gauges 

 and a safety valve, $35 ; a two horse power gasoline 

 engine, $85 ; and pipes and piping, $50 ; The cost of 

 pipes depends largely upon the distance of the power 

 from the barn. It is not necessary to have the power in 

 the barn or even near it. (See Chapter on Farm Power.) 



Operating Machine. When ready to begin milking 

 start the vacuum pump and place a milker between two 

 cows and open valve on main vacuum pipe. Bend over 

 teat cups and attach one by one to one cow and then 

 proceed to do the same with the other. Similarly attach 

 one or two more milkers, so as to keep four to six cows 

 milking at the same time. A short glass tube at the ma- 

 chine shows when the milking is completed. 



The mouthpieces on the teat cups must be of a size 

 to correspond with the size of the^teats. They must be 

 neither too small nor too large. It is important, also, 

 that the piping system be kept air tight and free from 

 moisture. 



Details concerning the installation and operation of 

 the machines may be had for the asking by writing to 

 the manufacturers. 



