536 Agricultural Experiment Station, Ithaca, N. Y. 



and now standing is shown in Fig. 108. The tops of the stacks 

 are dimly shown projecting from the roof of the main building at 

 the rear. A year or two after this, W. H. Bush, of Marion, built 

 brick stacks from cellar to cupola, and such stacks are now frequently 



108.— Evaporator on the Rogers homestead at Williamson. 



seen. The advantages of the brick stacks are durability and 

 safety from fire. The greatest danger of fire is inside the stack, 

 and the wooden fittings and trays of these brick towers could 

 bum out without setting fire to the building. It is the common 

 practice to build the stack inside the building, chiefly because it 

 is a prevailing opinion that the wind interferes with the draft if 

 the stack is built against the building and exposed on three sides. 

 This opinion is held in respect to brick stacks, in particular, for it 

 is thought that the air will draw through the brick walls, and that 

 they will also become damp in stormy weather, if exposed. This 

 notion appears to be unfounded, however, for "W. H. Bush, of whom 

 I have spoken, has recently erected a most successful establishment 

 at his new home at Walworth, with three outside brick stacks, with 

 four-inch walls. Mr. Bush has had much experience in the eva- 

 porating business, and as I consider his new outfit to be a model in 

 its way, I shall have much to say about it later on. (See Figs. 105, 

 109,110, 111, 112). 



The interior of one of these stacks must now be seen. We will 

 first turn our attention to the basement or foundation of Mr. Bush's 

 three stacks (Fig. 111). It will be seen that there are three fur- 



