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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
tta-percha stretched on wooden or metallic frames has also been proposed. When employed to point out shoals or dangers, they are painted of some distinctly visible color, and where more than one is anchored in the same vicinity, their colors are varied so that they may be readily distinguished from each other; for example, the buoys on one side of a channel may be black and those on the other red, so that the navigator can tell at once, by the color, on which side they are to be passed. Herbert's buoy (a) is intended to be anchored by having the mooring-chain attached near its center of gravity, so as to reduce the tendency to pitch and roll in rough water and impart greater stability to the buoy; the shape of the buoy and the conical hollow in its base also conduce to these objects. An improved buoy (f), designed to have similar advantages, was patented by W. M. Ellis, Oct. 7, 1856. It is moored by attaching the cables in the line of the calculated center of tidal pressure; a