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I, Wick of Stockholm (Sweden) patented in 1899 a heater 

 shown- in Fig. 19, where the heating is done by circulating 

 hot water in pipes which stir the 

 milk. There is an outer insulated 

 jacket in which the milk cylinder 

 is placed, and this has another 

 cylinder which holds hot water. 

 In the center of the latter is a 

 hollow shaft through which the 

 hot water enters and circulates 

 through the dasher made of 

 curved pipes which reach close to 

 the bottom and then turn up Fig. 19. 



again emptying into the space between the two inner cylinders 

 from where it goes into the outside heating space and out. 



In spite of the stirrers running close to the walls of all 

 these heaters, there will always be some coagulated albumen 

 on the sides and it has been proposed to have the stirrers 

 covered with brushes as shown in Fig. 20 a heater made by 

 Mr. W. Wetterling, of Wismar, Germany. Two steam cham- 

 bers are inserted in a barrel A, one G in the center and another 

 E ringformed, leaving an annular space between them. 



The milk enters into this by L and rises between the two 



steam chambers overflowing 

 the outside steam chamber E 

 and then down again between 

 E and a rotating cylinder B 

 and finally up in the barrel and 

 out by M. 



The rotating cylinder B has 

 brushes attached and so have 

 stirrers F, which are screwed 

 in the top of the rotating cylin- 

 der. 



The pulley D revolves th e 



Fig> 20. cylinder and the stirrers which 



brush the steam chambers on both sides continuously and 

 thus prevent the scorching. 



