Naval ARCHITECTURE (continued)

t, u, x, y. The same ribbands expressed in the fore-body.

It has been remarked above, that the horizontal plane is composed of water-lines and ribbands; it also contains the main and top-timber breadth-lines, or the longitudinal lines by which the main-breadth and top-timber-breadth are limited in every point of the Ship's length. The horizontal curve of the transoms and harpins are also represented therein, together with the planes of the principal timbers; the cant of the fashion-piece, the length of the rake afore and abaft, the projection of the cat-heads, and the curve of the upper-rail of the head, to which the curves of the lower ones are usually parallel.

HORIZONTAL PLANE. Plate I

Plate I

B A C. The line of the ship's length, passing through the middle of the stern and stern-post.

B. The tipper-end of the stern-post.

C. The upper-end of the stem.

B F. The length of the rake abaft.

D W X. The top-timber-breadth line, or the line which limits the breadth of each top-timber.

D F. The breadth of the aftmost timber at the tassarel.

B K. The wing-transom.

B L P. The horizontal curve of the deck-transom.

M M. the horizontal curve, or round-aft, of the first transom.

M N. The horizontal curve of the second transom: it is prolonged into a water-line, N 8 7.

k 0. The horizontal curve of the third transom, which is aifo prolonged into another water-line, 0, n, U, p, Q.

m O P. The plane of the fashion-piece, as canted aft.

O W U. The plane of the midship-frame.

a, b, c, d, e, f, h. The planes of the timbers before the midship-frame.

I, 2, 3, 4, 5, 6, 7, 8, 9. The planes of the timbers abaft the midshipframe.

X X. The figure of the upper-rail of the head.

C Y. The projection of the knee of the head.

The third horizontal ribband is marked on the plate.

a a. The projection of the cat-head.

Thus we have endeavoured briefly to explain the nature and uses of the principal draughts used in the construction of a ship, which reciprocally correspond with each other in the dimensions of length, breadth, and depth. Thus the plane of elevation is exactly of the same length with the horizontal or floor-plane. The several breadths of the timbers in the floor-plane and that of the projection are mutually transferable; and the real heighth of the timbers in the projection exactly conforms to their heighth in the elevation. Thus let it be required to transfer the heighth of the wing-transom from the elevation to the projection:

Reference Works