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 116
of boiler and the pressure to be carried. For-merly when comparatively low pressures were used (60 to75 pounds per square inch) the diagonal crow foot bracewas considered amply sufficient for staying the flat heads ofboilers of the cylindrical tubular type, both above and be-low the tubes, but in… … Fig. 38 pull at right angles to the plate, thus having a great advan-tage over the diagonal «tay in that the pull on the diagonal) stay per square inch of section is more than 5 per cent in excess of what a through stay would have to resist under^ the same conditions of pressure. The weakest…
