|nb£stigali0iT of lljc goarb of Crabc's 

 ^axmxxlR for tlje <^trtit0tlj of ^cttan- 

 0itlar SSlroHgljt-lioii <^irt-bof dlirtrcr 

 ^lajis. 



By J. W. I. HARVEY. 



^^ 



1 



m 



*< /) -><-- — ^ >• 



When W = width of combustion box in inches. 

 „ P = pitch of supporting bolts in inches. 

 ,, D = distance between the girders from centre to 

 centre in inches. 



239 



