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 507
Fig. 178 … -J/J Fig. 179 The boiler pressure at the time the cards were taken was90 lbs. per sq. in. but a 60 spring was used, when a muchbetter diagram might have been secured with a 50 spring. Diagram Analysis 495 The fluctuations in the steam lines S to C 0 are causedby the spring being of too high…
