14 



THE CONTAMINATION OF MILK. 



tory as by the other method tested by him. When the oper- 

 ator is in a hurry, and shortens the exposure down to three 

 seconds, the efficiency of the method is open to question. The 

 machine in which bottles, in an inverted position, are passed 



Fig. /. Sterilizer containing racks fo7- holding bottles. 



over steam' jets, likewise does poor work, unless its speed is so 

 slackened as to reduce its rated output (54) . Boiler scale com- 

 pounds, or oil in the feed water,' may so taint the steam that 

 an objectionable odor will be transmitted to the cans or bottles 

 and thence to the milk or cream. 



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