. A manual of marine engineering: comprising the design, construction, and working of marine machinery. w •73 a P9. DU TEMPLE BOILER. 417 row of tubes forming water walls on each side, with the usual openings atthe upper part, was often added to act as down-comers as well as walls. White Forsters Boiler is somewhat like Blechyndens, but it has thetubes curved in a longitudinal plane so as to be drawn into the drum andthrough the manhole at its end. Thornycrofts Boiler (fig. 149).—This boiler, known as the Speedytype, is the direct descendant of Goldsworthy-Gurneys invention ol 1627(see fig. 14
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. w •73 a P9. DU TEMPLE BOILER. 417 row of tubes forming water walls on each side, with the usual openings atthe upper part, was often added to act as down-comers as well as walls. White Forsters Boiler is somewhat like Blechyndens, but it has thetubes curved in a longitudinal plane so as to be drawn into the drum andthrough the manhole at its end. Thornycrofts Boiler (fig. 149).—This boiler, known as the Speedytype, is the direct descendant of Goldsworthy-Gurneys invention ol 1627(see fig. 140), and consists essentially of the top and bottom drums, as inthe Normaiid and Yarrow types, but the tubes in this case are not onlybent in so as to obtrude themselves on the space over the fire, but they arecarried up and around so as to enter the top of the drum instead of thebottom ; it is, therefore, distinctively a priming boiler, inasmuch as therecan be no circulation without the flow of water through the tubes into thesteam space. There are the usual downcast pipes at each end, which are ofconsiderab
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