90 



MACII1M-: I'KAWINt, .\M I ' 



shown in fig. 76. A B is the side elevation <>t a ji..ni ( ,n of one of 

 these girders. Each girder U supported at r th< plates 



) %'riuets at 2 pita 



o 



----- -about 'l8"--\ 



O O 



*l 



to 



I 

 I 



FIG. 76. 



forming the vertical sides of the fire-box. The fiat crown is bolted 

 to the girders as shown. Observe that the girders are in contact 



FlO. 76. 



with the crown onlv in the neighbourhood of the bolts. ' 

 carefully this part of the design, and then answer the 



