The height of the vertical centre of gravity above the keel or base line.

Related Terms

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

HYDROFINISHING

A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.

HYDROMETER

An instrument for determining either the specific gravity of a liquid or the API gravity.

MOAT

An annular depression that may not be continuous, located at the base of many sea mounts, islands, and other isolated elevations of the sea floor, analogous to the moat around a castle.

GROUND FOG

A fog that obscures less than six tenths of the sky, and does not extend to the base of any clouds

HOUR-GLASS EFFECT

A radarscope phenomenon which appears as a constriction or expansion of the display near the center of the plan position indicator, which can be caused by a nonlinear time base or the sweep plot starting on the radar indicator at the same instant as the transmission of the pulse. The phenomenon is most apparent when in narrow rivers or close to shore.

GYROSCOPIC DRIFT

The horizontal rotation of the spin axis of a gyroscope about the vertical axis

HEAVE

The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING

BASE

A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.

API GRAVITY

A gravity scale established by the American Petroleum Institute and in general use in the petroleum industry, the unit being called 'the A.P.I. degree' .

Related questions

MarineProHelp 2018 - 2022