A short board or swatch of heavy canvas, secured in a bridle of ropes, used to hoist a man aloft or over the ship's side for painting and similar work. Modern boatswain's chairs incorporate safety harnesses to prevent the occupant from falling.

Related Terms

ABSORBER

That part of the low side of an absorption system, used for absorbing vapor refrigerant.

WEATHER SIDE

The side of a ship exposed to the wind.

DERRICK

A device for hoisting and lowering heavy weights, cargo, stores, etc

BRIGHT STOCK

A heavy residual lubricant stock with low pour point, used in finished blends to provide good bearing film strength, prevent scuffing, and reduce oil consumption. Usually identified by its viscosity, SUS at 210°F or cSt at 100°C.

SHELL PLATING

The plates forming the outer side and bottom skin of the hull

GROUND CHAIN

Heavy chain used with permanent moorings and connecting the various legs or bridles

HAVEN

A place of safety for vessels

HARMFUL INTERFERENCE

Any emission, radiation or induction which endangers the functioning of a radionavigation service or of other safety services or seriously degrades, obstructs or repeatedly inter- rupts a radio-communication service operating in accordance with the International Telecommunications Union Regulations.

ICE BUOY

A sturdy buoy, usually a metal spar, used to replace a more easily damaged buoy during a period when heavy ice is anticipated.

PRESSURE DROP

Resistance to flow created by the element (media) in a filter or other equipment. Defined as the difference in pressure upstream (inlet side of the unit) and downstream (outlet side of the unit).

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