SwEETUNlvD CoNDliNSIjD MlI,K — 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 smaU 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 boihng 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 Condensivr con- 

 sists of a vertical cylinder of iron or 



Fig. 20. The surface condenser 



Courtesy ot Buffalo Foundry & 

 Machine Company 



