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 TB 55-1900-232-10
Beam sea
A sea that runs athwart the vessel's course
Beam wind
A wind that blows athwart the vessel's course.
Bear down
To approach the target.
Beaufort No. or scale
A numerical scale (from 0 to 12) used for rating wind velocity, m ascending strength.
Bird-caging
The phenomenon of wires flaring out around the full diameter of wire rope, with resulting kinks in the wires. This
can occur when there is a sudden release of a heavy load on a wire rope.
Bitt
A pair of metal posts to which mooring or towing lines are made fast
Bitter end
The last part of a rope or chain, in contrast to the middle part or bight
Bollard
Single cast-steel posts secured to a wharf or pier and used for mooring vessels by means of lines extending from
the vessel.
Bollard pull
The maximum pulling power of a ship at a given power rating, with no way on.
Bow thruster
A propeller used to control lateral movement of the bow.
Breaking strength
The actual or ultimate rated load required to pull a wire, strand or rope to destruction. As an aggregate value, the
sum of individual breaking loads of all wires in a strand or rope.
Breast line
A mooring line from ship to pier, or ship to ship, running perpendicular to the ship's fore-and-aft axis
Bridle
A tow-legged towing rig of wire or chain attached to towing pads or sets of bitts on the tow At the apex is a flounder
plate or ring, dependent upon whether a chain bridle is being used. The two legs and the imaginary line between
the points of attachment should form an equilateral triangle
Birdie rig
The rigging of a tow with two legs from the tow's bow to a flounder plate.
Bull rope
Colloquial term referring to a towing hawser
Bullnose
A closed chock at the bow of a vessel
Bulwark
Section of a ship's side continued above the main deck that serves as a protection against heavy weather.
BUSHIPS
Bureau of Ships, now Naval Sea Systems Command.
N-2
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