Gravity or Dilution Separators. 41 



ty-four hours is necessary to ripen. Churn at 62 degrees in 

 warm weather and 65 degrees in winter. We guarantee one- 

 third to one-half more cream b}^ using this separator than from 

 an}' other on the market." 



The "machines," as shown b}' the cut on the title page, are 

 simply tin cans fitted with upper and lower scale glasses, a 

 faucet at the bottom through which the skimmed milk is drawn 

 off and a wire ring at the top for holding a strainer cloth or cloth 

 cover. Hunt's has in the middle of the can a narrow tin tube, 

 open at the top and bottom, which constitutes the ventilating 

 feature of the apparatus. 



There is absolutely nothing new about these cans. The}' are 

 entirely similar in all essential features to the cans used in the 

 various deep setting gravity cream raising processes, as the 

 Cooley, Moseleyand others. Even the ventilating tube is not a 

 new device. So far as is known neither is patented although 

 " Patent is applied for " in the case of each, and the circulars 

 of Hunt's give strong warnings as to infringement. 



Attention is called to the way in which the term separator is 

 used in the name of these cans and in the descriptive matter con- 

 cerning them. As is well known, there are two forces used to 

 separate cream from milk ; the force of gravity acting upon a 

 mass of milk at rest in a suitable vessel, and centrifugal force 

 acting upon milk in motion in a rapidly revolving cylinder or 

 bowl. By common and universal consent the machines separat- 

 ing milk in this latter way are alone known as cream separators, 

 and while it is certainly stricth' true that any apparatus in which 

 cream is separated from milk may be called a cream separator, it 

 is as certainly misleading to apply the term cream separator to 

 any other than a centrifugal separator. An old-fashioned shal- 

 low pan is just as much and just as truly a " cream separator " 

 as are these cans. It is plainly evident in the above circulars, 

 though it is not distinctly so stated, that the idea is intended to 

 be conveyed that these are separators similar, at least in effi- 

 ciency, to centrifugal separators. 



