MICRO-OKGANISMS IN MILK 



313 



that has been published has been done with the Burrell-Lawrence- 

 Kennedy machine. In this machine the vacuum is produced at 

 the end of the teat, where a cup is provided to support the teat. 

 The air is prevented from entering the cup by a rubber curtain. 



" CONNECTOR 

 RELieF FILTER 



Fig. 129. — Details of construotion of Burrell-Lawrence-Kennedy machine. 

 (Harding, Wilpon, and Smith, Bull. No. 317, New York Agric. E.vp. Sta.) 



The four cups are connected by means of tubes to the teat cup 

 connector, and from here a large rubber tube connects with the 

 pail. A piece of glass tubing is inserted so that the passage of 

 milk can be observed. The vacuum is intermittent and pulsa- 

 tions occur about once a second. The rate of pulsation is adjust- 



Fig. 130. — Two styles of pulsator head of Burrell-Lawrence-Kennedy 

 machine. Blocks show sizes of filters. (Harding, Wilson, and Smith, Bull. 

 No. 317, New York Agric. Exp. Sta.) 



able. The air that is admitted between pulsations is filtered 

 through a cotton filter. 



The milking machine has proved to be helpful in milk 

 production and a better grade of milk can be produced than 

 by hand milking. However, good results clearly depend upon 



