A stationary element between stages of a multistage centrifugal compressor. It may include guide vanes for directing the flowing medium to the impeller of the succeeding stage. in conjunction with an adjacent diaphragm, it forms the diffuser surrounding t ...

Scoop like devices used to direct air into and ventilate a boat.

Railcars grouped in a train by destination so that segments (blocks) can be uncoupled and routed to different destinations as the train moves through various junctions. Eliminates the need to break up a train and sort individual railcars at each junction.

To bleed is the operation of draining any water out of a buoy which may have seeped inside after long use at sea.

To temporarily stop all movement of a line through a block by placing the hauling part across the sheave of the block. This jams the sheave and holds it tight, and a pull on the hauling part will release it.

Small, circular sheets of newly-formed ice that do not impede navigation.

Short lengths of line attached to the sail used to tie the extra sail out of the way when reefing.

Another term for a marine railway.

A long sturdy pole fitted with a blunt hook at one end designed to catch a line when coming alongside a pier or mooring, to facilitate putting a line over a piling, recovering an object dropped overboard, or in pushing or fending off.

A combination of one or more blocks and the associated tackle necessary to give a mechanical advantage. Useful for lifting heavy loads.

The wind direction indicator on the masthead.

An official signature or seal affixed to certain documents by the consul of the country of destination.

Waterproof clothing.

A term describing the seamen of a British warship.

Abbreviation for:- Port of Loading.- Petroleum, Oil, and Lubricants.

A metal fitting with an arm that uses a spring to close automatically when connected to another object.

A vertical post extending above the deck for securing mooring lines

A set of radio, sound, and visual signals designed to aid in communications between vessels without language problems. It can be used with Morse Code, with signal pennants, and by spoken code letters.

A single outlet or limited number of outlets in a building used to connect tools or equipment to the air system.

The point (speed of sound) at which air flow through an orifice can not increase regardless of pressure drop.