35 



steam jet. By this application, or by driving it with a gear- 

 ing at the top it is optional whether the milk shall be taken 

 in from the top or through the bottom bearing. The advan- 

 tage of the latter plan is obvious as the heater will act as an 

 elevator at the same time, thus killing two birds with one 

 stone. As the drum is twenty-eight inches deep it will be 

 possible to lift the milk at least two feet from inlet to the 

 outlet of the gutter, and with a higher speed than that used 

 by me, 450 to 500, it may be arranged to elevate to any height. 

 Mr. A. H. Barber (Chicago) later substituted the Hill 

 heater, Fig. 25, where the milk cylinder is kept rotating slowly 

 by the steam jet, which 

 heats the w r ater. Inside 

 this revolving cylinder 

 is a stationary one which 

 reduces the milk space 

 to a very narrow one. 

 The milk enters through 

 a center tube and rises 

 between the two cylin- 

 ders. It is made with 

 an hourly capacity of 

 from 500 Ibs. up to 2,500 

 Ibs. and sold at from f 35 

 to $75 the latter, if 



made 

 $.100. 



of copper, cost 



Another style is made 



where the cylinder is Fig. 25. 



revolved by a rope belt from 15 to 30 revolutions per minute. 

 A cooler on similar principle is also made. 

 Mr. A. B. Reek's (Denmark) heater is shown in Fig. 20. 

 Here the steam heat is applied to the inner drum B, which 

 is revolved by a hollow shaft A with pulleys S and goes 

 through the bearing b fixed on the frame not shown. The 

 steam enters through this shaft and the condensed water 

 is removed by two "skimming" tubes 8, to a fixed pipe V. 

 An outer stationary jacket C covers the steam drum, leaving 

 only J inch space between them. 



