A type of journal bearing in centrifugal air compressors.

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.

Two half hitches around a spar or post. Easy way to make a line temporarily fast to a piling or post. The clove hitch can jam under heavy tension, making it difficult to untie. Worse, is its tendency to untie itself when subjected to repeated strain and r ...

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

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.

The opening between the jib and the mainsail. Wind passing through this opening increases the pressure difference across the sides of the mainsail, helping to move the boat forward.

Froth of sea foam.

A compartment forward where the chain cable is stowed.

A sudden and violent gust of wind.

A bollard with horizontal arms, forming the shape of a cross, as a means of belaying lines.

BTU. The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit under set conditions of temperature and pressure.

see Turnbuckle

The imaginary line running from bow to stern along the middle of the boat.

Canvas, cloth, leather, tubing, rubber or other material placed around a line or cable to protect it from wear and abrasion

The stationary seating surface, the inlet of a valve.

Blowdown.

The quantity of heat required to raise the temperature of a unit weight of a substance by one degree.

Another term for a marine railway.

Any rope or line.

The logic of binary systems, such as control systems in which all operations may be reduced to on-off, open-closed, or similar dichotomous basis.