DOUBLE-JACK. See [Jack-screw].
DOUBLE-LAND. That appearance of a coast when the sea-line is bounded by parallel ranges of hills, rising inland one above the other.
DOUBLE-SIDED. A line-of-battle ship painted so as to show the ports of both decks; or a vessel painted to resemble one, as used to be frequent in the Indian marine.
DOUBLE-STAR. Two stars so close together as to be separable only with a telescope. They are either optically so owing to their accidental situation in the heavens, or physically near each other in space, and one of them revolving round the other.
DOUBLE-TIDE. Working double-tides is doing extra duty. (See [Work Double-tides].)
DOUBLE UPON, To. See [Doubling upon].
DOUBLE WALL-KNOT. With or without a crown, or a double crown, is made by intertwisting the unlaid ends of a rope in a peculiar manner.
DOUBLE-WHIP. A whip is simply a rope rove through a single block; a double whip is when it passes through a lower tail or hook-block, and the standing end is secured to the upper block, or where it is attached.
DOUBLING. (See [Rank].) Putting two ranks into one.
DOUBLING A CAPE. In navigation, is to sail round or pass beyond it, so that the point of land separates the ship from her former situation.