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 582
he back pressure Lubricating Appliances 569 would be greatly increased, and in order to get sufficientpositive pressure the condensing pipe should rise 18 inchesto 24 inches above the horizontal steampipe and then de-scend to the condenser. This will give a column of waterfor positive pressure… … tER VALVE<fr FILLING CAP
