312 



MILK 



When carefully used the machine has no injurious effect on 

 the teats or the udder. Some cows are difficult to milk by ma- 

 chine, as, for example, old cows, those advanced in the lactation 





Fig. 127. Globe milking machine. (Harding, Wilson, and Smith, Bull. No. 

 317, New York Agric. Exp. Sta.) 



period, those having abnormal teats or udders, and those with 

 nervous temperament. These must either be milked by hand or 

 removed from the herd. 



Fig. 128. Method of delivery of milk by Burrell-Lawrence-Kennedy machine. 

 Harding, Wilson, and Smith, Bull. No. 317, New York Agric. Exp. Sta.) 



The teat cups must always fit well to the teats, otherwise the 

 latter may be injured, or air may be sucked in and the milk be- 

 come contaminated. Most of the work on milking machines- 



