A blue and white flag (the flag for the letter 'P') hoisted at the foretrucks of ships about to sail. Formerly a white ship on a blue ground, but later a white square on a blue ground.

Related Terms

BOLTROPE

A strong rope stitched to edges of a sail

BUMPKIN

The spar projecting from stern of ship

PSID

pounds per square inch differential.

TRAMP FREIGHTER

A cargo ship engaged in the tramp trade.

CORDAGE

Ropes in the rigging of a ship

WEATHER SIDE

The side of a ship exposed to the wind.

DOGWATCH

A short, evening period of watch duty on a ship

PSIG

pounds per square inch gauge (PSIA - 14.696).

FARDAGE

A wood placed in bottom of ship to keep cargo dry

ATMOSPHERIC PRESSURE

Pressure exerted by the atmosphere at any specific location. (Sea level pressure is approximately 14.7 pounds per square inch absolute.)

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