Rudiments of Naval Architecture: Or, An Exposition of the Elementary ... by James Peake

Author:James Peake
Language: eng
Format: epub
Publisher: J. Weale
Published: 1849-03-25T05:00:00+00:00

portions of the room and space given to the timbers of the frame. The scarphs are coaked or dowelled together with three dowels, and on bolting the shelf one bolt is generally placed through it at each frame timber, except forward and aft, where the distance between these bolts varies from 2 feet 6 inches to 3 feet; the upper surface of the shelf a b, on which the beam end rests, should be below a level, to prevent a lodgement of water. Fig. S is a section showing the method used by Mr. Lang, master shipwright of Woolwich Yard, in working the shelf, as doing away with the chocks, which are necessary in the plan. Fig. 1, to receive the iron knees that unite the ends of the beams to the sides of the ship (Plate 3); this arrangement will be again adverted to when that part of the structure is described. The bolts used for the shelf are of copper, varying in diameter from jths of an inch to 1J inch, according to the tonnagid of the ship and the thickness of the body at the several portions of the same ship where the

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shelf is worked. These bolts should form part of the regular fiastening of the outside planking, and should be placed as nearly square to it as the nature of the work will admit; for it should carefuUj he kept in view that the shortest fastening through a given or fixed thickness is to be preferred, as embracing twofold advantages—that of strength, together with economy in the use of such expensive material as copper; and also, that a reduction of copper bolts in length, with no diminution in the firmness of the hull, is attended with the best result to the naval constructor—the maximum lightness of the hull of the ship. To exemplify this, the accompanying sketch is given as descriptive of the lower shelf of most ships, the shelf laying oblique to the timber of the frame.

a b the usual level bolt, cutting the outside plank obliquely. . c d the bolt placed square to the outside planking, shorter tt^an abf more square to the seating of the shelf on the timbers, and thence a stronger and cheaper fastening.

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