Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 238
was conveyedthrough a 6-inch pipe, yet owing to the many drains onthe pipe for heating buildings, running other smallengines, etc., by the time the steam reached the enginein question the pressure was reduced so much that a 30spring was found to be too strong, although that wasthe scale of Fig. 71.… … FIGURE 72. there were no less than four superfluous elbows in theexhaust pipe that could easily be dispensed with. Thediagram shows that the cut off was practically useless.That the back pressure was nearly 6 lbs. above theatmosphere, and that the engine was using 55 lbs. ofsteam and 7 lbs. of coal…
