62 



to be sold and not manufactured, and in view also of the diffi- 

 culties of heating all the milk in a boo^y when we have to 

 handle large quantities such as must be handled at milk 

 shipping stations if pasteurizing is ever to be introduced gen- 

 erally, I haVe suggested the following plan : 



Use any continuous heater which you find best, but in- 

 stead of running the milk directly to the cooler, run it into a 

 storage tank, which should hold one-third of the hourly ca- 

 pacity of your heater and cooler if you desire to keep the 

 milk for 20 minutes at the high temperature or one-half if you 

 want to keep it 30 minutes. 



This tank may either be built with water space filled 

 with water at 155 or better still be properly insulated so as 

 to hold the temperature within 5. 



By having one partition in the tank and two attached to 

 the cover the milk is compelled to go to the bottom first then 

 up, then down and at last up and out to the cooler, and I 

 challenge bacteriologists to show any reason why this ar- 

 rangement does not solve the problem of combining a contin- 

 uous apparatus with the strictest bacteriological demands! 



What is more, I believe that this system of instantaneous 

 (so to say) heating is better than the slower heating of a large 

 body of milk in a tank unless indeed all the milk arrives at 

 once and is left for hours at the dangerous temperature. 



D. H. Burrell & Co. have adopted a better plan, and 

 have all the partitions soldered on the tank, every other being 

 soldered to the sides and bottom, and every other being open 

 at tht bottom; and A. H. Reid has adopted a vat similar to 

 the Danish Weston separator heater. (See Fig. 102.) 



Even if it should be found necessary to have several 

 tanks each of a capacity to hold the milk absolutely for the 

 required time, as proposed by Mr. J. D. Frederiksen, this 

 would be better than the slow heating and cooling of 3,000 

 or 4,000 Ibs. of milk. 



If the milk is 60 or above, it is surely better, the quicker 

 it is heated up. While I express this as my belief at present, 

 I hope to see the experiment stations take the matter up in a 

 practical manner free from scientific punctiliousness. 



