EVAPORATED MILK STERILIZING 



139 



It is advisable and important to establish the efficiency of 

 heat distribution in the sterilizer by accurate test. For_this 

 purpose the use of cans equipped with automatic thermometers, 

 similar to medical thermometers, but registering sterilizing tem- 

 peratures, may be found practical. Such cans are placed in 

 different parts in the cages of the sterilizer at the time the ster- 

 ilizer is loaded, and at the conclusion of the process these 



Can fitted with Closed Top 

 and Tell-Tale Thermometer 

 for Open Bath and Retort 



Pig-. 60. 



Evaporated milk can 

 with tell-tale ther- 

 mometer, complete 



Fig-. 62. 



Wrench for sealing* and 

 opening- can 



Pig-. 61. 

 Tell-tale thermometer 



Courtesy of Taylor Instrument Co. 



thermometers indicate the maximum temperature to which the 

 contents of the respective cans were heated. Unfortunately 

 these thermometers are not always accurate and often they do not 

 function properly. Then again the jars to which they are sub- 

 jected in the revolving cage and again when the trays contain- 

 ing these cans are removed from the sterilizer, frequently change 

 the position of the mercury column, rendering its readings un- 

 reliable and misleading. 



Another and very simple and reliable method of testing 



