Most common material is phenolic resin-impregnated laminated fabrics, such as asbestos or cotton cloth. For oil free service, bronze and carbon/graphite vanes are used.

A control line, usually a multi-purchase tackle, secured to the boom to prevent it from lifting. Can also apply to other spars, such as gaffs.

A term for stowing cargo in a container.

Fine separated particles floating in the air and clouding it. A substance in the gaseous state.

Is the pressure exerted by a vapor confined within a given space. The vapor may be the sole occupant of the space, or may be associated with other gases.

Costs that vary directly with the level of activity within a short time. Examples include costs of moving cargo inland on trains or trucks, stevedoring in some ports, and short-term equipment leases. For business analysis, all costs are either defined as ...

Magnetic variation. The difference, east or west, between magnetic north and true north, measured as an angle. Magnetic variation varies in different geographic locations.

The oxidation of conventional hydrocarbon lubricants when they reach the end of their useful life and begin to breakdown. Can cause operating temperature increase, increase brake horsepower and plugs separator, can destroy air end.

An order to cease (stop).

A line drawn to indicate both the direction and magnitude of a force, such as leeway or a current.

A shifting of the wind direction, opposite of backing. Clockwise in the northern hemisphere, counter-clockwise in the southern hemisphere.

To slack off or move off; also said of a change of direction of wind, when the wind shifts to a different direction.

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

A container designed with openings in the side and/or end walls to permit the ingress of outside air when the doors are closed.

A device for furnishing fresh air to compartments below deck or exhausting foul air. Construction designed to lead air below decks. May have a cowl, which can be angled into or away from the wind; and may be constructed with baffles, so that water is not ...

A wooden or metal pipe used to supply or to exhaust air.

An opening through which fresh air is supplied to a space or cabin.

The swiveled opening at the top of a ventilator.

An enterprise in which there is a risk of loss.

A tube with a narrow throat (a constriction) that increases the velocity and lowers the pressure of the liquid passing through it, creating a partial vacuum immediately after the constriction in the tube. The vacuum created has a sucking effect, and a ven ...