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 rope spliced into the end of a block and used for making it fast to rigging or spars. Such a block is called a tail-block.

An opening such as a hole or vent. An opening through which air can pass, or a restricted opening placed in a pipe line to provide a means of controlling or measuring flow.

1,000 board feet. One MBM equals 2,265 C.M.

A unit of electrical current or rate of flow of electrons through a conductor. One volt across one ohm of resistance causes a current flow of one ampere. One ampere is equal to 6.25 x 1018 electrons per second passing a set point in a circuit.

A metal air-tight tank built into a boat to insure flotation even when the boat is swamped.

The process of plotting a theoretical position or future position based on advancing from a known position using speed, time, and course, without aid of objects on land, of sights, etc. Term comes from deduced reckoning, abbreviated first to "ded reckonin ...

To charge less than the proper amount.

A sprocket wheel on the windlass for taking links of the chain cable.

A grooved metal extrusion fitted on a forestay and used to secure the luff of a sail by holding its bolt rope in place.

A method of docking with a boat's stern to the dock.

Is one which 1) handles a small constant flow of liquid with the gas; 2) utilizes evaporative (injection) cooling; or 3) circulates a liquid for sealing and/or cooling. The last may or may not be evaporative cooling.

Transportation charge advanced by one carrier to another to be collected by the later carrier from the consignor or consignee.

The ability of a boat to keep from being moved sideways by the wind. Keels, daggerboards, centerboards, and leeboards are all used to improve a boat's lateral resistance.

The Captain of a vessel. Highest officer aboard ship. Oversees all ship operations. Keeps ships records. Handles accounting and bookkeeping. Takes command of vessel in inclement weather and in crowded or narrow waters. Handles communications.

Cargo thrown overboard in order to lighten the ship and washed ashore.

The tendency of the strands of a line to fray out at the ends.

On square-rigged ships, the lines which are lead from the masthead to the ends of the yards to support them.

Wind that is deflected from it's normal course by the sails

Cargo more than eight feet high which thus cannot fit into a standard container.