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Structure supporting sheaves or blocks that projects over a vessel's side or stern, to hoist up boats.



Related Terms

BOATSWAIN'S CHAIR

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.

LANGMUIR DIFFUSION PUMP

A type of diffusion pump in which the mercury vapor emerges from a nozzle, giving it motion in a direction away from the high-vacuum side of the pump.

BACKSTAY

The stay extending from ship's mastheads to the side of the ship

JACOB'S LADDER

A rope ladder suspended from the side of a vessel and used for boarding.

ASSEMBLING BOLT

A threaded bolt for holding together temporarily the several parts of a structure during riveting.

TENSILE STRESS

A stress that causes two parts of an elastic body, on either side of a typical stress plane, to pull apart.

BILGE KEELS

Pair of keels on either side of the hull, usually slanted outwards. In yachts, they allow the use of a drying mooring, the boat standing upright on the keels (and often a skeg) when the tide is out.

CHICAGO BOOM

A hoisting device that is supported on the structure being erected.

HERRINGBONE GEAR

The equivalent of two helical gears of opposite hand placed side by side.

CHOCK-A-BLOCK

When the lower block of a tackle is pulled so tight to the upper one, so that it will hoist no higher; also called two-blocks.

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