Buoy

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BUOY. A piece of wood, or an empty barrel, floating on the water, to show the place where it is shallow, to indicate the danger there is to navigation. The act of Congress, approved the 28th September, 1850, enacts, " that all buoys along the coast, in bays, harbors, sounds, or channels, shall be colored and numbered, so that passing up the coast or sound, or entering the bay, harbor or channel, red buoys with even numbers, shall be passed on the starboard hand, black buoys, with uneven numbers, on the port hand, and buoys with red and black stripes on either hand. Buoys in channel ways to be colored with alternate white and black perpendicular stripes."

References in classic literature ?
The spirits of the party, however, which had been elated on first varying their journeying from land to water, had now lost some of their buoyancy.
I had little time to dwell upon the coincidence of the simultaneous failure of the wireless and the buoyancy generators, since very shortly after the Coldwater had dropped so low over the waters that all my attention was necessarily centered upon the delicate business of settling upon the waves without breaking my ship's back.
Her stern buoyancy tanks prevented her dropping with great rapidity; but Thurid was firing rapidly now in an attempt to burst these also, that I might be dashed to death in the swift fall that would instantly follow a successful shot.
The damage to the buoyancy tanks had evidently been more grievous than he had at first believed.
She knew that her buoyancy tanks might keep her afloat indefinitely, but she had neither food nor water, and she was being borne toward the least-known area of Barsoom.
I could not get around the fact that many of these other boats could rise faster than ours by the fact of their greater buoyancy, but I was none the less determined to reach the outer world far in advance of them or die a death of my own choosing in event of failure.
The liability of shipping another such sea was enormously increased by the water that weighed the boat down and robbed it of its buoyancy.
You don't allow for our national buoyancy and uplift.
She had noted the slight, dry cough, the daily brightening cheek; nor could the lustre of the eye, and the airy buoyancy born of fever, deceive her.
The medium of buoyancy is contained within the thin metal walls of the body and consists of the eighth Barsoomian ray, or ray of propulsion, as it may be termed in view of its properties.
The deep distress that so evidently affected Marmaduke was in some measure communicated to Elizabeth also; for a look of dejection shaded her intelligent features, and the buoyancy of her animated spirits was sensibly softened.
The passionate excitement of Love and the buoyancy of spirit attendant upon intoxication are its less holy pleasures - the price of which, to those souls who make choice of "Al Aaraaf" as their residence after life, is final death and annihilation.