The main boom is 95 feet long[F] and made like a cask.  The staves are 31 in number, of white pine, 2-1/4 inches thick; the staves are of different lengths, so as to vary the points at which they respectively abut.  The extreme length of boom is obtained by two lengths of the staves; small cogs of wood are let in at intervals, half in one stave and half in its neighbour, so as to keep them from drawing, the whole bound together with strong hoops fitted with screws.  The extreme diameter of the boom is 26 inches where the sheets are fixed, tapering off at the jaws, and 13 inches at the boom end.  To give additional support to the boom, an iron outrigger, extending about 3 feet on each side thereof, is fixed where the boom-sheets are placed, and a strong iron brace extends from the jaws through the outrigger to the boom end.  The gaff is of spruce, 61 feet long and 9 inches diameter.

The bowsprit is of white pine, 38 feet long, 18 of which is outboard; the remainder comes under the deck, is let in to each beam, and abuts against the bitts:  it is 24 inches diameter, and bored out like the mast, from 10 inches diameter at the heel to 7 at the end.  The jibboom is made of two pieces of yellow pine, grooved out and hooped together; it is about 70 feet long and about 8 inches in diameter; the foot of the jib is laced to this spar on hooks (when required).

The mainsail is made with the seams horizontal, to avoid the resistance perpendicular seams in so large a sail would offer to the wind.  It has been calculated that the resistance of perpendicular seams, in a sail of this size, is equal to that of a plank 10 inches broad and 60 feet long, placed on end broadside to the wind; the luff of the sail is 66 feet; the foot, 93; the head, 50; the head and foot of the sail are laced to battens under gaff and on boom; the luff is brought to the mast by a contrivance as original as it is perfect; two battens are fixed on afterpart of the mast, about an inch and a half apart, the inner parts shod with iron, and rather broader than the exterior opening.  To each eyelet-hole of the sail a strong brass-plate is fixed, having 4 rollers traversing fore and aft, and 2 transversely; these plates, as the sail goes up, are slipped into the grooves of the battens, the rollers preventing friction, and the battens keeping the luff fixed to the after centre line of the mast—­without this ingenious arrangement the huge mast would, if on a wind, becalm at least three feet of the sail—­three lazy-jacks are fitted to support the huge mass of canvas when lowering the sail.

The jib is 69 feet in the hoist, and 70 in the foot.

The bobstays are of solid iron, running 8 feet on each side of the keel, and going through a strong iron cap over the bowsprit end, where, a strong iron washer being put on, they are securely fixed with a nut.