The unstable operation of a centrifugal compressor below the design point of the compressor.

Eight double strokes on ship's bell; customarily struck at midnight when new year commences.

Land ice, either afloat or on ground, that is composed of layers of sow that have become firm but have not turned to glacier ice.

A container with a discharge hatch in the front wall; allows bulk commodities to be carried.

Applied to a wind, or movement of a vessel, to denote brisk and lively.

Document indicating the goods were loaded onboard when a document of title (b/L) is not needed. Typically used when a company is shipping goods to itself.

Technically, a flat-bottomed boat, but often used to name any small boat for rowing, sculling, or fitted with an outboard motor

All boats are referred to as female. She is at anchor. Her sails are set. She is beautiful.

Reduces the area of the mainsail by partially lowering the sail and re-securing the new foot by tying it to the boom with points, or light lines attached to the sail. Also called points reefing and jiffy reefing.

Two iron flatsided hooks reversed to one another.

A fan that generates (by pushing) a flow of ambient air over the exterior of the finned pipes to dissipate the sensible heat.

The volume displaced by the compressing element of the first stage per unit of time.

The weight of an empty cargo-carrying piece of equipment plus any fixtures permanently attached.

A wire rope or line between davit heads.

The wheel operating the steering gear and by which the vessel is steered.

Is the speed required of a rotary compressor to maintain a given discharge pressure, supplying leakage only (zero actual output). It is an experience factor.

A line attached between a safety harness and a secure part of the boat.

In a wooden vessel, a plank in the hull springs when one of its ends breaks loose, and because of its shape bent to the curve of the hull, springs outwards beyond that curve. Such a plank is said to be sprung.

In general the line, web straps, cable or chains attached to a heavy object to lift it.

A disease caused by lack of Vitamin C historically common to seaman, because of the difficulty in preserving fresh fruits and vegetables.