40 



From this time on the "self-raising" heaters became more 

 general. 



Paasch, Larsen & Peterson (Denmark) make the heater 

 shown in Fig. 30, which explains itself. The milk enters at 

 A and is elevated to the conductor B, leading to the cooler. 

 The steam enters at C and is forced to the sides by a plate 

 protecting the can from being overheated. It will be noticed 



Fig. 30. 



that no elbows are used on the milk pipes, but T's which 

 have caps so that each length of pipe may be cleaned like a 

 gun barrel. 



Axel Malmquist (Denmark) built a heater where the main 

 change consisted in dividing the heating jacket in 3 spaces. 

 The middle one contains steam under pressure, the lower one 

 contains the condensing water and the upper one warm water. 

 He claims that by confining the hottest heating surface to 

 the center scorching is made impossible. 



The new Bergedorfer (Germany) heater, Fig. 31, is de- 

 scribed in (M. Z. 1899, page 354) as follows. Instead of the 



