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22 straps, the outer being double and the inner _ treble-riveted, with openly-, spaced rivets in the third row. The edges of the outer strap are slightly chamfered. From a little above the turn of the bilge the plate edges are sheared in lines approximating to the sheer of the ship, and the strakes be- low are worked as stealers into the. edge of the lowest of the parallel strakes, thus avoiding an excessive number of narrow strakes at the bow and stern, as shown in the engrav- ings just indicated. The framing un- STEERING GEAR SPACE far 2 642 PRICE ENG GENERAL ARRANGEMENT OF TURBINES OF THE LUSITANIA, der the turbine-seating is consider- ably deeper than elsewhere, and ad- ditional fore and aft girders are in- troduced. ) As to the vertical framing from the margin-plate to the shelter deck, it is .continuous. These frames are formed of channels 10 in. by 20-40 in. by 4. im, ty 4 in. by 23-40 in. for 3-5-1 amidships to 9 in. by 20-40 in. by 4 in. by 4 in. by 23-40 in., secured by heavy brackets to the margin-plate, and for- tified by web-frames at an average of four frame-spaces apart. The shell- plating covering these vertical frames is arranged for the turn of the bilge in strakes parallel with the sheer line, worked with lapped edges and _ with lapped butts wHere they are in one thickness. The plates are. gener- ally about 33 ft, long--that is, 12 THe Marine REVIEW frame-spaces, plus: the lap of the butt; the edges, are treble-riveted, and the butts quadruple-riveted. High-tensile steel was used 'for a considerable number of the upper as well as the sheer-strakes for a great 'length of the hull amidship. The ex- - tent of their use is illustrated by the diagram, Fig. 2. The lightly hatched parts are of. one thickness only, and of the same scantling as would have been adopted for' mild steel; the more heavily hatched portions are in. two thicknesses and of reduced scantling, Tuaso GENERATOR MIN AIA PUMPS. Oar ain PUMPS ar in consideration of the strength of the material. Throughout the region of doubled thickness hydraulic rivet- ing was adopted. The edges are tre- ble-riveted, andthe butts of the dou- bled portion are strapped outside and 'inside at the butts of the outside plates, the outer straps taking three _ tows of rivets, and the inner straps taking four rows; the thickness of the straps is reduced on account of the doubling. The butts of the inside plates are strapped on the inside and quadruple-riveted, Similar insurance against hogging stresses was extended to the upper decks, and thus a considerable portion of the shelter and a fair part of the upper deck (Fig. 3) are of high-ten- sile steel, and were riveted by hydrau- lic power. This section shows the de- tails of the sheer-strakes, with the beams carrying 'the shelter and upper decks--a connection, which is of con- siderable importance to the structural strength: The remaining deck-plating is principally of such a nature as is necessary to provide suitable floor- ings, and occupies only a_ secondary place as regards' the © structural strength of the vessel. -- The large openings in the decks-- viz., funnels and ventilators--are ar- ranged, as far as practicable, in the same fore-and-aft lines, so that im- once AP TURBINE cone QP GP portant strakes of plating are run through for long -- uninterrupted lengths, and these openings have heavy doublings and _ well-rounded corners, The main bulkheads are formed of high-tensile steel, 14 in. thick in the lower parts, and 9-20 in. thick up to the main deck. Above this they are 6-20 in. thick, also of high-tensile steel. There are 11 main transverse bulkheads, and the sub-division is car- ried considerably further by the lon- gitudinal. bunker bulkheads, by the two bulkheads in the engine-room, and by the partial bulkheads in the coal- bunkers, The midship section, Fig. 1, shows how the longitudinal bulkheads are stiffened and braced to the side. These engine-room bulkheads, being