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Plates fitted on a forward weather deck to form a V-shaped shield against water that is shipped over the bow

Related Terms

SEQUESTER

To form a stable, water-soluble complex.

BALL BEARING

An anti-friction rolling type bearing containing rolling elements in the form of balls.

CLOUD POINT

The temperature at which waxy crystals in an oil or fuel form a cloudy appearance.

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

DEMULSIBILITY

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.

DEMULSIBILITY

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.

FREEBOARD DECK

Deck to which freeboard is measured

HALF-TIDE BASIN

A lock of very large size and usually of irregular shape, the gates of which are kept open for several hours after high tide so that vessels may enter as long as there is sufficient depth over the sill. Vessels remain in the half-tide basin until the ensuing flood tide before they may pass through the gate to the inner harbor. If entry to the inner harbor is required before this time, water must be admitted to the half-tide basin from some external source.

GROUND LOG

A device for determining the course and speed over the ground in shallow water consisting of a lead or weight attached to a line. The lead is thrown overboard and allowed to rest on the bottom. The course over ground is indicated by the direction the line tends and the speed by the amount of line paid out in a unit of time.
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