Construction navale dans le fer et l'acier / un traité pratique . . re jamais plus près de 15 pouces, ni plus loin que 20 pouces. Ces intervalles ont été progressivement augmentés vers les extrémités, où ils ont varié de 2 à 3 pieds. Les brides extérieures des fers à friser étaient alors, comme aujourd'hui, tournées vers l'arrière dans le corps avant et vers l'avant dans le corps suivant, de manière à toujours avoir un angle d'obutilisation entre les deux brides, et donc réduire la force du fer à friser moins que ce qui serait thecase si l'angle était aigu, de plus, vous pouvez bénéficier de plus de facilités pour le rivetage du placage inférieur. Une autre illustration de

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Shipbuilding in iron and steel / a practical treatise . . re never nearer than 15 inches, nor further apart than 20 inches. These intervals were augmented gradually toward the extremities, where they varied from 2 to 3 feet. The outer flanges of the frame angle-irons were then, as now, turned aft in the fore body, and forward in the after body, so as to always have an obtuse angle between the two flanges, andthus reduce the strength of the angle-iron less than would be thecase if the angle were acute, and in addition give greater facilitiesfor riveting the bottom plating. Another illustration of the old transverse single frames is givenin Fig. 71, which represents the midship section of the Birken-head. It will be seen that in wake of the beam-ends short Chap. V. Systems of Framing. 75 pieces of reversed angle-iron were worked, for the purpose ofreceiving the fastenings of the waterway, plate shelf, &c. Theconnection of the beams to the ships side was peculiar, and will bedescribed hereafter. The scantlings of the frames and their spacino-. Fig. n. were as follows:—For 120 feet amidships, 5 by 4^ by inches, spaced 15 inches apart; forward, 5 by 4^ by /g inches, spaced18 inches apart; and aft 5 by 4i by -^^ inches, spaced 20 inchesapart from centre to centre. The total length of the ship was 210feet, and it will be seen from the above that the framing of the 76 Transvcise aiid Longitudinal Chap. v. extremities was considerably lighter than that of the amidshipportion. The longitudinal bulkheads marked A in the sketchwere fitted in the fore and after holds, and were so arranged as toform the sides of tlie magazines, the water-tiglit plating B beingworked on the floors between them as shown in the sketch. Inwake of the engines and boilers the lower deck was discontinued, and the longitudmal bulkheads forming the sides of the coalbunkers were continuous from the floors to the upper deck, beingstiffened by vertical angle-irons, worked upon the plating of thebulkheads, an

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• bookcentury1800
• bookdecade1860
• bookpublisherlondo
• bookyear1869