When rope comes aboard a vessel and is put to use, it is called line, although some still call it rope if it is over one inch in diameter.

A lightly powered or unpowered drum intended solely for rope storage

Roll On/Roll Off

A pneumatic device with a rotary output. Typically of a vane or rack-and-pinion construction.

A compressor belonging to the group of displacement rotary compressors, a type of valve less displacement machine. Also referred to as "Roots blower".

Machines in which compression is effected by the positive action of rotating elements.

Machines in which axial vanes slide radially in an eccentrically mounted rotor.

An instrument consisting of a series of graduated cylinders possessing selective collection efficiencies. It is used for the measurement of quantities relating to the size distribution of cloud droplets.

A type of anemometer in which the rotation of an element serves to measure the wind. Rotation anemometers are divided into two classes; those in which the axis of rotation is horizontal, such as the windmill anemometer, and those in which the axis of rota ...

An electric generator consists of an armature and a field structure. The armature carries the wire loop, coil, or other windings in which the voltage is induced, whereas the field structure produces the magnetic field. In small generators, the armature is ...

The rotating element of a machine and, in the case of a compressor, is composed of the impeller (impellers) and shaft, and may include shaft sleeves and a thrust balancing device.

A verb with a variety of meanings. To round in is to haul in quickly; to round up is to bring a sailing vessel head into the wind; to round down a tackle is to overhaul it; to round a mark is to pass a racing mark.

One complete turn of the line around a cleat, spar or another line.

A knot widely used when making a boat fast to a post or bollard.

Turning out all hands on board ship in the morning, or calling the watch for duty on deck.

The manner in which a shipment moves; i.e., the carriers handling it and the points at which the carriers interchange.

A method of moving a boat with oars. The person rowing the boat faces backwards, bringing the blade of the oars out of the water and toward the bow of the boat. They then pull the oars through the water toward the stern of the boat, moving the boat forwar ...

A small boat designed to be rowed by use of its oars. Some dinghies are rowboats.

On a square-rigged ship, a light weather sail set next above the topgallant-sail in fair weather.

Rinave Portuguesa (Portuguese class society).