A mechanical lever formed between the force of weight acting vertically downward (from the centre of gravity) and the displaced force of buoyancy on heel acting upward (from centre of buoyancy on heel). It is a measure of a vessel's ability to return to the upright after heeling. It is termed the GZ lever and is calculated as a weight times a distance (a moment)
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DIELECTRIC STRENGTH
A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)
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COMPRESSOR
A device which converts mechanical force and motion into pneumatic flow power.
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MOMENT OF INERTIA
The quantity obtained by multiplying the mass of each small part of a body by the square of its distance from an axis, and adding all the results.
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COPPER STRIP CORROSION
A qualitative measure of the tendency of a petroleum product to corrode pure copper.
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SALINITY
A measure of the concentration of dissolved mineral substances in water.
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GREENWICH HOUR ANGLE
Angular distance west of the Greenwich celestial meridian; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of the Greenwich celestial meridian and the hour circle of a point on the celestial sphere, measured westward from the Greenwich celestial meridian throug
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HARPOON LOG
A log which consists of a rotator and distance registering device combined in a single unit, which is towed through the water. The TAFFRAIL LOG is similar except that the registering device is located at the taffrail, with only the rotator in the water.
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HEAVE
The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING
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FRICTION
The resisting force encountered at the common boundary between two bodies when, under the action of an external force, one body, moves or tends to move relative to the surface of the other.
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ASH
A measure of the amount of inorganic material in lubricating oil. Determined by burning the oil and weighing the residue. Results expressed as percent by weight.
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