Shifting the moving block of a tackle from one place of attachment to another place farther along to give more advantage.

Space between the floor of holds and the bottom of the ship.

A method of preventing the ends of a line from unlaying or fraying by turns of small stuff, stout twine or seizing wire with the ends tucked.

A hand hold. Usually along the cabin top or ladder.

The direct sailing line in which a racing mark or buoy can be fetched while sailing the desired course

The compass points of North, East, South and West. Intercardinal or half-cardinal points are Southeast, Southwest, Northwest and Northeast

Condensation which occurs when a ship sails from a cool to a relatively warm climate.

A term indicating a temperature relationship between two temperatures or temperature variation between two points.

A line used to hoist or lower a sail, flag or spar. The tightness of the halyard can affect sail shape.

The line by which a boat is connected to a mooring buoy; a short rope hanging from a spar having at its free end a spliced thimble or a block. Sometimes called "Pennant".

The ship's water closet (toilet or wash-room). The upper edge of a quadrilateral sail.

Away from land, toward the water.

The distance between a rope's adjacent strands, giving a measure of the tightness of the lay. The shorter the distance, the harder the lay. When a line has been overused and the lay has become slack, it is said to be slack-jawed.

Standard pressure and temperature. See standard air.

A strong tropical counterclockwise revolving storm the southern hemisphere. In the northern hemisphere these storms revolve clockwise and are known as hurricanes.

A compressor belonging to the group of dynamic compressors. Characterized by having its flow in the axial direction.

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.

A thermal expansion valve.

An opening in a ship's deck for the loading and discharging of any kind of cargo.