THE EVAPORATION OF THE JUICE TO SYRUP. 



inverted syphons connecting the discharge of one with the intake of the next 

 body, and these are of such a length that the leg connected with the second 

 body is from 12 to 18 inches longer than the column of liquid which is due 

 to the greatest pressure that can be possibly obtained between the two vessels. 

 This apparatus is to a large extent self adjusting; there is only one cock to 

 control the flow of the juice into the apparatus, and the system of circulation 

 prevents the juice in any vessel rising much above the level of the tube plate. 



FIG. 161. 



Hagemann Evaporator. This specialized type of standard 

 evaporator is shown in Fig. 160. The peculiar points in this design are the 

 automatic regulation of the flow of the juice by traps a and by the juice- 

 trays b taking the place of the syphons in Chapman's design ; the horizontal 

 baffles c in the calandria ensure the action of the hottest steam at the upper 

 level of juice and the vertical baffles d give an up and down circulation to the 

 juice. 



291 



