SWEETENED CONDENSED MILK CONDENSING 



69 



projects through the dome it is equipped with motor, pump, piston, 

 striking cup and hydrometer. The striking cup at its upper end 

 terminates in a small chamber equipped with a sight-glass through 

 which the operator notes the position of the hydrometer. 



The Condenser. The condenser 

 is that portion of the condensing ap- 

 paratus in which the vapors, rising 

 from the boiling milk in the pan, are 

 condensed to water. The condenser 

 is attached to the dome of the^ pan. 

 There are three types of condensers in 

 use, the surface condenser, the baro- 

 metric condenser and the wet-vacuum 

 spray condenser. 



Fig. 19. Vacuum breaker or blow- 

 down valve 

 Courtesy Arthur Harris & Co. 



THE SURFACE CONDENSER consists 

 of a tube cylinder filled with brass 

 tubes, mounted on a receiver. The 

 water used for cooling circulates out- 

 side of the tubes and the vapors pass 

 through the tubes, where they are 

 chilled and condensed. This conden- 

 ser has the advantage of enabling the 

 operator to note the amount of con- 

 densation and to measure the amount 

 of water actually condensed. The re- 

 ceiver at the bottom of the condenser 

 should be so arranged that it can be 

 drained at will and without interfer- 

 ing with or retarding the operation of 

 the pan. 



THE BAROMETRIC CONDENSER con- 



Fig. 20. The surface condenser 



sists of a vertical cylinder of iron or Courte JLch 



chine 



