Machines in which air or gas is compressed by the mechanical action of rotating vanes or impellers imparting velocity and pressure to the flowing medium. (Raise the pressure of the air by converting the energy from the velocity of the air to pressure.)

Narrow triangular sail set on a long yard or spar, the forward end of which is hauled down so that it sets obliquely on the mast with a high peak.

Thin strips of wood put around the hatches, to keep the tarpaulin down. Also put upon rigging to keep it from chafing. A large batten widened at the end, and put upon rigging, is called a scotchman.

The relationship of flow per unit area to differential pressure across a filter medium.

A thousand.

Name given to the lowest deck in a ship.

To haul in.

A navigational aid with a light that flashes about once per second.

A mallet used for passing serving around a line.

A cap for the top of the mast.

A train of a specified number of railcars, perhaps 100, which remain as a unit for a designated destination or until a change in routing is made.

Machines cooled by water circulated through jackets surrounding the cylinders or casings.

A compartment having a watertight bulkhead at each end.

Direction from which the wind is blowing; an unsailable sector between close hauled headings.

Goods floating on surface of sea after a wreck.

A float with a flag at the top of a pole. Used to mark a position such as for a mooring, a race or a man overboard.

The swiveled opening at the top of a ventilator.

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

In general, a person employed in a sea-going vessel. In some cases, applied to a seaman who works on deck.

The last buoy as a boat heads to sea.