Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 137
Fig. 48 Bridge walls should be built straight across from wallto wall of the setting, and should not be curved to conform.to the circle of the boiler shell. The proper distance fromthe top of the bridge wall to the bottom of the boiler variesfrom eight to ten inches, depending upon the size of…
