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 65
here is no ebulli-tion, and elimination of a great many parts of the undu-lating header type of boiler. The design of the boiler showsabsence of stay-bolted surfaces, the drums are not exposedto the direct action of the fire, all seams or rivets are en-tirely removed from contact with the heat,… … —>L.rtt»-4 Fig. 23duplex water tube boiler Duplex Water Tube Boiler 53 of the shell of the rear drum form the connection to a setof headers below it, which are connected to the front drumby tubes expanded into the shell of the latter. This com-prises the upper generating system. These headers…
