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 current bore them along at a rapid rate; the light spirits of the Canadian voyageurs, which had occasionally flagged upon land, rose to their accustomed buoyancy on finding themselves again upon the water.
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.
You don't allow for our national buoyancy and uplift.
They marked the buoyancy of her tread, like the skim of a bird which had not quite alighted.
With a buoyancy and hopefulness and a gaiety that hardly ever flagged, Richard had a carelessness in his character that quite perplexed me, principally because he mistook it, in such a very odd way, for prudence.
The swifter craft are seldom equipped with large buoyancy tanks, since the added bulk of them tends to reduce a vessel's speed.
The black's next shot was more accurate, striking my flier full upon the prow and exploding with the instant of contact, ripping wide open the bow buoyancy tanks and disabling the engine.
A close examination revealed the face that one of the buoyancy tanks had been punctured, but the engine itself was uninjured.
When we pass in the street the poor deluded soul subdues her buoyancy, as if it were shame to walk happy before one she has lamed, and at such times the rustle of her gown is whispered words of comfort to me, and her arms are kindly wings that wish I was a little boy like David.
Thrilling to the speed and the buoyancy and the obedience of the little craft the girl drove toward the northwest.
The solitude and the savage freedom filled his heart with life and buoyancy.
Trent smoked his cigar placidly and, taking off his cap bared his head to the sweeping sea-wind, which seemed laden with life and buoyancy.