A colorless, odorless, tasteless gas. A mixture of individual gases. The gaseous mixture surrounding the earth. Standard density of dry air free of carbon dioxide (0

The cone-shaped shield at the top of the smokestack.

A light showing an unbroken light over an arc of the horizon of 360 degrees. An anchor or riding light is an all-round light.

Sailing close-hauled

A receptacle which serves to store compressed air for heavy demands in excess of compressor capacity.

The pressure of a system or device measured from absolute zero.

A short oar. To scull, is to impel a boat by one oar at the stern.

(1) Describing a boat that lacks stability. (2) A small dinghy or launch used to transport crew and equipment from shore to a larger boat (3) One who serves as a precautionary standby, such as a line tender

A commission issued, licensing the commander of a privately owned ship to cruise in search of enemy merchant vessels. see Privateer.

the attraction to, and retention of particles in, a filter medium by electrostatic forces, or by molecular attraction between the particles and the medium.

A general term for a floating craft that carries passengers, cargo or both

The ratio in percentage of the time that the equipment is in operation to the total working time.

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 buoy moored near a Lightship from which she can check her position to make sure that she has not moved by dragging.

A component on a compressed air line that provides wide are coverage with a thin sheet of air. Also amplifies compressed air flow, reduces noise. Used in blowing, cooling. Also known as air knife.

Saluting

In navigation, the angle between the point at which the sun rises and sets and the true east and west points of the horizon.

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

The small triangular space found at the intersection of lines of position on a chart when a ship's position is determined by taking three bearings.

Sails, such as the spinnaker, reacher and reaching staysail used when running or reaching