IQO THE BUSINESS OF DAIRYING 



with the vacuum pump is a vacuum reservoir and 

 a pipe running the whole length of the cow stable, 

 with a connection valve or vacuum cock between 

 each pair of cows. A safety valve is connected to 

 the reservoir to prevent the vacuum from running 

 higher than is desired. 



The machine itself (page 188) consists of a heavy 

 tin pail, which is cone-shaped and holds about 

 55 pounds of milk. The cover of this pail is a disk, 

 in which is a vacuum motor which produces the pul- 

 sations in drawing the milk from the teats. The 

 cover fits the pail tightly and excludes all air. 



To operate the machine it is placed between the 

 pair of cows to be milked. A rubber tube connects 

 the pail top or pulsator with the vacuum cock above 

 the stanchions. On opening the cock the air is drawn 

 from the pail and the motor immediately starts. 

 The degree of pressure maintained is about one-half 

 atmosphere, or 7^2 pounds to the square inch. Lead- 

 ing from the pail cover or pulsator are two flexible 

 tubes besides the one leading to the vacuum cock 

 above the stanchions. At the end of each tube are 

 4 cups, which are fitted over the teats of the cow. 

 The milk from the 2 cows is discharged into one pail 

 (page 189). In operation the machine makes a 

 low, clicking sound, which is caused by the motor. 

 The vacuum pulsations run from 50 to 70 per minute 

 and may be easily adjusted to the speed required. 

 The milk in passing from the cow to the pail goes 

 through a glass inspection tube, so that the operator 

 may watch the flow. When the milk ceases to flow 

 the suction is turned off and the action of the ma- 



