Shipbuilding in iron and steel / a practical treatise . . Chap. III. On Stems. 49 welded together; if scarphed, the length of the scarphs must beeight times the thickness. The Liverpool Eules require that thefeet of stems shall be extended so as to form part of the keel, notless than four and a half feet long. The various devices which wehave previously seen resorted to for connecting external keels withthe vertical keelson-plates—grooves, rabbets, simple laps, and side-bars—have all been repeated in the case of stems. Even with side-bar keels, however, the stem is frequently solid, and when t
Shipbuilding in iron and steel / a practical treatise . . Chap. III. On Stems. 49 welded together; if scarphed, the length of the scarphs must beeight times the thickness. The Liverpool Eules require that thefeet of stems shall be extended so as to form part of the keel, notless than four and a half feet long. The various devices which wehave previously seen resorted to for connecting external keels withthe vertical keelson-plates—grooves, rabbets, simple laps, and side-bars—have all been repeated in the case of stems. Even with side-bar keels, however, the stem is frequently solid, and when this isthe case, either the central through-plate is scored for somedistance into the stem, or the stem is formed to run along the sideof the through-plate on one side, and thus form a scarph with theside-bar of the keel on the opposite side. In other cases of side-bar keels, the side-bars scarph with the stem on each side of thecentre through-plate, as shown in the sketches in Fig. 48, which. or SCARPH Fig. 48. represent the scarphing of the stem and keel of troop-ship Orontes. It will be seen, also, that in this case the continuousplate is tapered down in depth from station A, and at the stationon the after side of B is cut down to the same depth as the side-bars. At A there is an athwartship bulkhead, at which the gutter-plate ends, but the angle-irons at the middle line are run throughand secured to the deep-throated floor-plates on the fore side. Thelength of the plane scarph made by the side-bar and the stem is20 inches, and the butt of the centre plate is 8 inches from eachtermination of the scarphs, the whole length of the after partof the stem directly connected with the keel-plates being 4 feet8 inches, ^Yhe^e internal or flat-plate keels are used, the solid stem runs E 50 On Stents. Chap. III. down inside and is simply riveted to the keel-plates, garboards, andbottom plating, as shown in Fig. 49, which represents the junctionof the keel and stem of an
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1869
