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William Falconer's Dictionary of the MarineReference Works
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P

PACKET or PACKET-BOAT to PARSLING

PARTING to PAYING-OFF

PAYING-OUT, or PAYING-AWAY to PILOT

PIN of a block to PLANKING
PIN of a block
PINK
PINNACE
PINTLES
PIRATE
PITCH
To PITCH the seams
PITCHING
PLANE
PLANKING

PLAT to POLE-MAST

Under bare POLES to PRAM or PRAME

PRATIC to PROP

PROTEST to PURSER


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PITCHING

PITCHING, (tangage, Fr. appicciare, Ital.) may be defined, the vertical vibration which the length of a ship makes about her center of gravity; or the movement, by which she plunges her head and after-part alternately into the hollow of the sea.

This motion may proceed from two causes: the waves, which agitate the vessel; and the wind upon the sails, which makes her stoop to every blast thereof. The first absolutely depends upon the agitation of the sea, and is not susceptible of inquiry; and the second is occasioned by the inclination of the masts, and may be submitted to certain established maxims [Saverien, Dict. Marine].

When the wind acts upon the sails the mast yields to its effort, with an inclination which increases in proportion to the length of the mast to the augmentation of the wind, and to the comparative weight and distribution of the ship's lading.

The repulsion of the water, to the effort of gravity, opposes itself to this inclination, or at least sustains it, by as much as the repulsion exceeds the momentum, or absolute effort of the mast, upon which the wind operates. At the end of each blast, when the wind suspends its action, this repulsion lifts the vessel and these sucessive inclinations and repulsions produce the movement of pitching, which is very inconvenient; and when it is considerable will greatly retard the course, as well as endanger the mast, and strain the vessel.


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© Derived from Thomas Cadell's new corrected edition, London: 1780, page 215, 2004
Published by South Seas, using the Web Academic Resource Publisher
To cite this page use: http://nla.gov.au/nla.cs-ss-refs-falc-0961