CHAPTER VI 



EFFICIENCY OF VARIOUS APPARATUS 



During the writer's experience in the actual 

 operation of pasteurizing plants, a great many sam- 

 ples of milk have been taken which have been ex- 

 amined for their bacterial content in order to de- 

 termine the efficiency of the various pasteurizing 

 plants in the destruction of bacteria. These results 

 have been tabulated, showing the bacterial content 

 before, during and after pasteurization. In these 

 tables the kind of apparatus are indicated by fig- 

 ures only, no name of apparatus or of the manu- 

 facturers being given. The dealers at whose plants 

 the tests were made are indicated as "A," "B," 

 "C," etc. Thus at a plant operated by dealer 

 "A," for instance, a heater illustrated by Fig. 00, 

 a holder like Fig. 00, and a cooler like Fig. 00 may 

 have been employed. 



Lest the reader be misled as to the efficiency 

 of certain definite forms of apparatus, and lest cer- 

 tain manufacturers be led to feel that results ob- 

 tained have failed to give justice to the apparatus 

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