Gravity or Dilution Separators. 43. 



having an outlet in the center of said bottom, a cooler within 

 said can and provided on its bottom with feet supporting the 

 cooler over said outlet with passages under the cooler, said feet 

 serving to prevent eddying of the outflowing liquid and causing 

 a draft of said liquid equally from all sides of the can to the out- 

 let and also promoting the discharge of the sediment from the 

 bottom of the can substantially as described." 



It will be seen that the claim for the patent is based upon the 

 outlet of the large can which is ' ' centrally depressed and at the 

 center' ' and in the construction of the legs or supports on the bot- 

 tom of the cooler. In the can received by us from the company^ 

 the outlet is not in the center but at the side, and the cooler, with- 

 out any legs or supports whatever, is made to set flat upon the bot- 

 tom of the larger can. It would seem as though the patent must 

 be regarded, even by the company, as of practicall}^ no value. 



PRACTICAL TRIALS. 



All three of these ' ' Separators ' ' have been used according to 

 the directions. The room in which the cans were set was at a 

 temperature of 65-75 degrees. The water used was at a tempera- 

 ture between 50 and 60, and in all cases the cans set rather more 

 than twelve hours before they were skimmed. They were 

 skimmed by drawing the mixture of skim milk and water from 

 the bottom till the cream line was within one inch of the bottom 

 of the can. The fat in this skim milk and water was determined 

 by the Babcock Test, and then correcting for the water added, 

 the percentage of fat in the skimmed milk and water was secured. 



The milk used was, at first the mixed evening's milk of the 

 Universit}^ herd and it was set as soon as milked and taken ta 

 the dairy. Many of the cows were in advanced lactation and 

 giving small amounts of milk, and it was found that it creamed 

 very imperfectly though we had been having no difficulty at all 

 in skimming it perfectly clean with the centrifugal separator. 

 For the later trials the milk of a few cows fresh within two or three 

 months was reserved so that the trials have included milk that is 

 representative of all milk likely to be found on farms. 



In all the trials made with Hunt's and Wheeler's cans com- 

 parisons were made with Cooley cans set in ice water without 

 dilution. The trials with the Aquatic were made later with 

 milk from the same cows, but no comparisons were made with 

 the Cooley. The results are shown in the tables following : 



