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.

– Substance that makes things stick.

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.

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

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

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

A winch having a rope storage capacity and used for topping, lowering and supporting a boom under load and no load.

Without any means of powering, except for hand power.

A prime mover which is suitable for operating the deck machinery at its full designed load.

Vapour rising like steam or smoke from the sea caused by very cold air blowing over it.

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

– A motor providing rotary or linear motion.

The maximum rope tension (in kilonewtons), measured at the drum exit when the drum ceases to rotate in the direction of haul, the prime mover being set for maximum torque and the rope being wound on the drum in a single layer.

A test applied to each machine produced by a manufacturer.

A crane with a jib which may be rotated by turning gear and adjusted in the vertical plane.

The maximum rope tension (in kilonewtons), measured at the drum commences to rotate in the direction of haul, the prime mover being set for maximum torque under automatic control and the rope being wound on the drum in a single layer.

The operation of securing the ratlines to the shrouds.

A winch having a rope storage capacity and used for slewing and retaining a boom.

A crane with a boom consisted of several sections, being capable of moving the weight positions though folding the boom.

A lightly powered or unpowered drum intended solely for rope storage