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An upright, usually of wood, with a padded cradle on the top where the boom is rested; it is held in place by sockets and removed after the sail is hoisted.

Related Terms

BOLTROPE

A strong rope stitched to edges of a sail

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

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.

HARMONIC CONSTANTS

The amplitudes and epochs of the harmonic constituents of the tide or tidal current at any place

FRETTING

Wear phenomena taking place between two surfaces having oscillatory relative motion of small amplitude.

ARMATURE BAR

Copper bars used in place of wire windings, in large armatures, generators, or motors.

HAVEN

A place of safety for vessels

HARMONIC ANALYSIS

The process by which the observed tide or tidal current at any place is separated into basic harmonic constituents. Also called HARMONIC REDUCTION.

OIL RING

A loose ring, the inner surface of which rides a shaft or journal and dips into a reservoir of lubricant from which it carries the lubricant to the top of a bearing by its rotation with the shaft.

FORESAIL

The lowest sail set on the foremast of square-rigged ship
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