51 



bottom; these two pipes are at the upper end joined at b 

 where the steam enters. 



Both vessels are also connected by a pipe (c) by which 



the condensed steam escapes 

 from the inner vessel into the 

 outer, from which it again 

 flows through the pipe (d). The 

 inlet of the milk is regulated 

 by an ordinary regulator cup (e) 

 with float, same as used on 

 the separators. After the milk 

 has passed down through the 

 inner conical aperture, it rises 

 through the outer one and flows 

 over the rim of the annular re- 

 ceiver placed round the above 

 named regulator cup, and flows 

 off through the pipe (g). At 

 the base of the outer vessel are fitted a faucet (h) (for drawing 

 off the milk remaining in the apparatus after the work is 

 finished) and a screw-plug (1) for emptying out the heating 

 water from the outer vessel. The inner vessel is emptied of 

 its water through the opening n, by means of a syphon. 



It is made in sizes to heat from 1,300 ft>s. to 3,600 ft>s. per 

 hour. 



D. H. Burrell & Co., of Little Falls, N. Y., have also 

 adopted this idea in their double surface heater, Fig. 50. It 



Fig. 49. 



