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 152
Fig. 56square feet of grate surface in the boiler^ and the seats ofall such safety valves shall have an angle of inclination of45^ to the center line of their axis/^ Boiler Setting and Equipment 139 … Fig. 57» inside view of a pop safety valve In order to arrive at accurate results in lever safety valve calculations it is necessary to know first the number of pounds pressure exerted upon the stem of the valve by 140 Steam Engineering the lever itself, irrespective of the weight, also the…
