Shipbuilding in iron and steel / a practical treatise . . the lightei-. It should be observed,however, that these calculations are based, for the most part, upontheoretical considerations, and that in his work on Iron Ship-building Mr. Fairbairn states, as the result of experiment, thatas regards the strengths with equal weights for beams or frames itis in favour of oak; but goes on to say that, on account of thesuperior fastenings in the hull of an iron ship the number of beamscan be considerably decreased, and thus a great reduction of weightbe effected, while at the same time the strength o
Shipbuilding in iron and steel / a practical treatise . . the lightei-. It should be observed,however, that these calculations are based, for the most part, upontheoretical considerations, and that in his work on Iron Ship-building Mr. Fairbairn states, as the result of experiment, thatas regards the strengths with equal weights for beams or frames itis in favour of oak; but goes on to say that, on account of thesuperior fastenings in the hull of an iron ship the number of beamscan be considerably decreased, and thus a great reduction of weightbe effected, while at the same time the strength of the ship as awhole is considerably greater than could be possibly attained in awooden ship. 138 Deck Framino- and Pillarijio-. Chap. VIII. The forms of section which have been adopted for iron beamsare very various, and are illustrated in Fig. 95. In some lightvessels, and in the framing of mere platforms in larger vessels, thesection marked a has been used, the broader flange of the angle-iron being vertical. In some ships two angle-irons set back to. d^h\ Fig. 95. back, as sliown by h, and riveted together,have been used to form the beams; and inother vessels the simple angle-iron arrange-ment given above at a, has been modifiedby riveting another angle-iron on the loweredge, as shown in section by c. In the construction of the com-posite gunboats for Service, a bulb angle-iron has been usedfor the deck beam, of the section illustrated by d. In many of theearlier iron ships the beams were formed of a vertical plate withdouble angle-irons on the upper edge, similar to that shown insection by e, and this arrangement has been modified by rivetingto the lower edge strips of plate or half-round iron, in the mannershown by / and g. In some ships the beams have been formed inthe manner shown by h, and this was the section adopted on someof the decks of the * Great Eastern. One of the forms of sectionnow in most common use for large beams is that given at i, and it Chap. VIII.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1869
