87 



CLEANING MILK BY CENTRIFUGAL FORCE. 



But what is the use of all these elaborate devices, with 

 the daily cleaning of pipes, etc., when we have in the separa- 

 tor a device easy to clean and perfect in action, the only draw- 

 back being the power required. 



When creaming milk by centrifugal force was intro- 

 duced it w r as soon discovered that even the most carefully 

 strained milk would leave a layer of sediment on the walls 

 of the bowl. As this consisted of fine dirt and dung and 

 scales which had passed the sieve and also fine bits of mem- 

 brane from the milk, as well as bacteria adhering, the 

 thought of purifying milk by centrifugal force lay near. F. 

 Ludloff, of Berlin, (Germany) and others have made special 



Fig. 85. 



Fig. 84. 



separators for this use, and Prols. Dunbar and Kister describe 

 in Milch Zeitung, 1813!), a separator constructed like 

 those used in laundries with perforated bowls, Fig. 84. These 

 bowls are lined with fine strainer cloth and the milk forced 

 through by centrifugal force, as shown by the arrows, and 

 this is in reality nothing but a filter, like the International 

 filter, only the pressure employed is greater and in spite of 

 this, the cloths will soon be clogged and have to be renew r ed. 

 Far better is the Heines milk cleaning separator, Fig. 85. 

 The milk enters the bowl at a and the separation of the 

 heavier dirt commences at b, and it gathers on the wall of the 

 revolving drum, C C. The milk passes out of the separator 

 through the filter cloth d, whereby any lighter foreign sub- 

 stance is retained. The drum is large and revolves only 1.000 

 revolutions per minute, and the capacity is about -,~>00 Ibs. per 

 hour. 



