Steel disc, that is dogged down over a porthole to secure against breakage of the glass and to prevent light from showing through.

Upward displacing swells.

A penalty charge against shippers or consignees for delaying the carrier's equipment beyond the allowed free time. The free time and demurrage charges are set forth in the charter party or freight tariff.- See also Detention and Per Diem.

To temporarily sew the ends of two ropes together for rendering through a block. Also to grip together parts of a fall to prevent running out. To marry strands to prepare for splicing.

Time saved, reward for quick turnaround in dry cargo only.

Said of wind when exactly ahead; and of another vessel when her fore and aft line coincides with observer's line of sight.

The ratio and percent of the actual delivered capacity (measured at inlet temperature, pressure and gas composition) to the piston displacement.

A large foresail which extends aft behind the mast.

A container designed with openings in the side and/or end walls to permit the ingress of outside air when the doors are closed.

One of the large square openings in the deck of a ship through which freight is hoisted in or out, and access is had to the hold.

A pilot with a license stating that they are qualified to guide vessels in a particular area.

A sail set forward of the foremast on the headstay; a foresail

To fake line back and forth on deck.

The permitted increase in pressure developed after the valve has opened. Usually expressed in percentage, ie.; 3% accumulation (A.S.M.E. Code, Section I). Flows through safety/relief valves are officially determined at these overpressure conditions.

A wind shift that allows a boat to sail above its mean wind course.

A tube with a narrow throat (a constriction) that increases the velocity and lowers the pressure of the liquid passing through it, creating a partial vacuum immediately after the constriction in the tube. The vacuum created has a sucking effect, and a ven ...

A short-sea vessel which transfers cargo between a central "hub" port and smaller "spoke" ports.

Name given to the lowest deck in a ship.

A wind coming from the east.

The general name for ropes, blocks and tackles, tools, etc. (things).