DIAGRAM REPRESENTING A SHIP WITH TRUSSED FRAMES
This was one element of Seppings’ system. The others were: the filling in of the spaces between the ground frames of the ship, so as to oppose with a continuous mass of timber the tendency of the lower parts to compress longitudinally, and to form a thick and solid bottom; the omission of the interior planking below the orlop clamps; the connection of the beams with the frames by means of shelf-pieces, waterways, and side binding-strakes to the deck; and the laying of the decks diagonally.
In two other important respects Seppings improved on previous construction.
At Trafalgar the Victory, during her end-on approach to the enemy line, was raked, and her old-fashioned forecastle, with its thin flat-fronted bulkhead rising above the low head, was riddled and splintered. This and similar experiences led to the introduction by the Surveyor of an improved bow, formed by prolonging the topsides to meet in a high curved stem, which not only deflected raking shot, but also consolidated the bow into a strong wedge-shaped structure supporting a lofty bowsprit, and capable of being armed to give ahead fire from a number of guns.
Similarly the weakness of ships’ sterns was remedied. The broad flat overhanging stern which had been given to our ships throughout the eighteenth century was not only structurally, but defensively weak. In many actions, but notably in Admiral Cornwallis’ fighting retreat from the French in 1795, the weakness of our stern fire had been severely felt; and, especially in view of the possible adaptation of steam to ship propulsion, at this time foreshadowed, the desirability of an improvement was evident. Seppings abolished the flat stern in all new two- and three-deckers, substituting sterns circular (as seen from above), more compactly embodied, and having ports and embrasures in them for guns capable of fire along divergent radii. The circular stern gave place, after a few years, to an elliptical stern, which presented a more graceful appearance and afforded increased protection to the rudder-head. “The principal curves visible in it,” it was said, “harmonize so well with the sheer lines of the ship, that she appears to float lightly and easily upon the water.”
In the opening years of the new century important advances were made, too, in the organization of the royal dockyards. The interests of naval architecture were served notably by Sir Samuel Bentham, brother of the famous jurist and an ex-shipwright, who acquired honours in Russia and returned to England to be Civil Architect and Engineer to the navy. Bentham became a courageous Commissioner, and did much to stamp out abuses and to encourage efficiency; he was instrumental in checking the sale of stores, in abolishing “chips,” in introducing steam pumps, block machinery, and dry dock caissons, in improving the methods of building ships and of mounting carronades.
But still naval architecture, considered either as an art or as a science, was stagnant. As a class the Surveyors were men of very restricted education—“there is scarcely a name on the list of any eminence as a designer or a writer.” Those who ordered ships at the Board were “busy politicians, or amateurs without a knowledge of science, or sailors too impatient of innovation to regard improvements.” In no other profession, perhaps, were theory and practice so out of sympathy with each other. The native art of the builder was numbed and shackled, by the restrictions imposed upon him as to tonnage and dimensions; the study of ship form, with a view to analysing the forces under which sailing ships moved by wind through water and to discovering the laws which those forces obeyed, was still mainly an academic pastime of the Society for Improving Naval Architecture, and outside the province of the naval authorities. Our ships were still formed on no rational principle. Captured French ships served as models to be copied. Often our builders would make fanciful variations from the originals—a little more sheer, a little more beam, etc. etc.—and as often they spoiled their copies. Whenever they followed closely the forms and features of the originals they succeeded in producing vessels which were pronounced to be among the best ships in the navy.