Timber, metal or plastic rigging spreaders that are angled forward to increase mast support transversely and longitudinally. The stays they support are called jumper stays.

Related Terms

BEARING

A support or guide by means of which a moving part such as a shaft or axle is positioned with respect to the other parts of a mechanism.

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.

CHOCK, BOAT

A cradle or support for a lifeboat.

ADSORPTION

Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.

FORWARD

The front part of a ship.

BASE

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

ADSORPTION INHIBITOR

They are materials which caused them to be adsorbed on to the metal surface due to their polar properties.

ASPERITIES

microscopic projections on metal surfaces resulting from normal surface-finishing processes. Interference between opposing asperities in sliding or rolling applications is a source of friction, and can lead to metal welding and scoring. Ideally, the lubricating film between two moving surfaces should be thicker than the combined height of the opposing asperities.

FILM STRENGTH

Property of a lubricant that acts to prevent scuffing or scoring of metal parts.

ANODIZING

The treatment of a metal surface whereby the metal is made anodic.

Related questions

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