Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 151
t is sustained by the impact and re-action of the issuing steam, until the pressure has subsidedsufficiently to allow the spring to overcome these actions. A short space will be devoted to the consideration of thelever safety valve also, as it may be of interest to somestudents. 138 Steam… … Fig. 56 square 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. k Boiler Setting and Equipment 139
