12. 



chambers overflowing the outside steam 

 chamber E and then down again be- 

 tween 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 the stirrers F which 

 are screwed in the top of the rotating 

 cylinder. 



The pulley D revolves the cylinder 

 and the stirrers which brush the steam 

 chambers on both sides continuously 

 and thus prevent the scorching. 



DIERKS D. MOLLMAN hi Osiiab- 

 ruck also aims to prevent scorching by 

 providing the dasher with brushes see Fig. 18. The milk is forced 

 through it with the milk pump A and passes between two cylinders 

 which are placed in a tank D, and from there it is forced up through 

 the pipe M to the cooler. 



The rod E rotates the stirrer s which is 

 provided with brushes. The steam pipe c 

 has a lower opening into D and an upper one 

 in the centre of B shown by the arrows. 



The cover of the outer cylinder can be 

 taken off. 



HOCHMUTH " has also left his surface 

 heaters described elsewhere and constructs 

 an apparatus with stirrer which he rotates by 

 the steam used for heating. 



SURFACE HEATERS WITH MILK EX- 

 POSED. 



We have thus traced the Fjord heater in 

 all its evolutions and turn now to those 

 heaters where the milk is allowed to trickle 

 over the outside of a heating surface by it's 

 own gravity. 



In Sweden DE LAVAL constructed the 

 well made if rather expensive combined heat- 

 er and cooler. Fig. 14. 



Fig. 14. 



