File:Buoys 6.png

Illustration from 1911 Encyclopædia Britannica, article BUOYS.

Original text: Buoys intended for moorings (fig. 6) may be of shape and colour according to the discretion of the authority within whose jurisdiction they are laid ... Mooring buoys (fig. 6) for battleships are built of steel in four watertight compartments, and have sufficient buoyancy to keep afloat should a compartment be pierced; they are 13 ft. long with a diameter of 6½ ft.

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