A J^IJW TOBK EVAPORATOR 89 



Bush's three stacks (Fig. 21) . It will be seen that there are three 

 furnaces, one under each tower or stack. There are two long 

 openings into each, to admit the air. The smoke pipes from these 

 furnaces run off across the cellar and discharge into the chimney, 

 which is plainly shown in Fig. 19. Going up stairs, we find the 

 aspect of the stack on the first fioor to be that shown in Fig. 22. 

 This is the door through which the trays are placed into the stack. 

 If we raise this door, f w, and look down to the furnace, we see 

 a coil of stovepipe, p in Fig. 16, over which the air passes on its 

 way up the tower. But before we proceed to an examination of 

 the inside of this tower, let us look more carefully to the arrange- 

 ments in Fig. 22. The tray is laid upon the frames a a (one of 

 these is shown at a in Fig. 16), the little door, F, is raised, and 

 the tray is shoved into the stack, v is a hand-hole, inside of 

 which a thermometer may be hung, w is a large door, fastened 

 by a button at x, to be used whenever the stack is cleaned or 

 repaired. The opening is large enough to admit a man. 



"We are now ready to go inside the stack, and we will take 

 Fig. 16 as our guide. The stack is thirty-eight feet high, over all, 

 the walls four inches thick with one coat of plaster on the inside, 

 and the shaft is large enough to admit the regulation size of tray, 

 which is forty-nine inches square. A stack of this size holds 

 twenty -five trays. The back wall of the stack is the blank space 

 bounded by the letters o Y s in the diagram a. A side wall is 

 shown in diagonal section at the left, bounded by the letters 

 T E w Y. The door through which the trays are inserted, on the 

 first floor, is at w, and one of the frames on which the trays are 

 rested when they are shoved in, is at a. (See the same letters in 

 Fig. 22.) The warming pipes are at P (see also Fig. 21). The 

 stack passes into the second story at F, and the upper door, from 

 which the trays are removed, is at E. Above this point, the stack 

 serves as draft -chimney, and as a resting place for the lifting 

 device. Fig. 17 shows a direct front view of a cross-section of 

 the stack. 



" The chief essential in the interior arrangement of a tower is 

 some apparatus for lifting the trays, to allow of a tray of fresh 

 fruit to be placed in at the bottom of the stack. Some of these 



