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 507
A Fig. 178 … Fig. 179 -J/T 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…
