two triple blocks strapped to eye-bolts under the jaws of the gaff, one on each side, through the two other sheaves of which the peak brails lead. Each brail is a single rope, middled at the leech of the sail.

Tacks, Sheets, Clewlines, &c.—It is much more convenient to have the tack and sheet blocks of the courses fastened to the clews of the courses by hooks. Then they can be unhooked when the sail is furled, and, in light weather, a single rope with a hook, called a lazy sheet, can be used, instead of the heavy tacks and sheets with their blocks. This is also much more convenient in clewing up. The main tack is rove aft through the block in the waterways, forward through the block on the sail, and the standing part hooks to the block on deck. The fore tack goes through a block on the bumpkin. The sheets of the courses have the after block hooked to an eye-bolt in the side, abaft the channels, and the forward one hooked to the clew of the sail, the running part reeving through a sheave-hole in the rail. The sheets of all the square sails but the courses run from the clew of the sail, through sheave-holes in the yard-arms, through the quarter blocks, down on deck. The topsail sheets are chain, are clasped to the clews of the sail, and are fitted with a gun-tackle purchase at the foot of the mast. The topgallant and royal sheets are single. The topsail and topgallant clewlines reeve through the quarter-blocks. The royal clewlines are single, and the topsail and topgallant are a gun-tackle purchase.