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An idiom for the bottom of the sea.



Related Terms

ARMING THE LEAD

Placing tallow in the recess in the bottom of the sounding lead to ascertain the nature of the sea bed.

DOCK SILL

The foundation at the bottom of the entrance to a dry dock or lock against which the caisson or gates close. The depth of water controlling the use of the dock or lock is measured from the sill to the surface.

CROWN WEIR

The highest point on the internal bottom surface of the crown of a plumbing trap.

PANCAKE AUGER

An auger having one spiral web, 12 to 15 inches (30 to 38 centimeters) in diameter, attached to the bottom end of a slender central shaft; used as removable deadman to which a drill rig or guy line is anchored.

V BOTTOM

A hull with the bottom section in the shape of a 'V'.

BLASTHOLE

  1. A hole that takes a heavy charge of explosive. 2. The hole through which water enters in the bottom of a pump stock.

GRIDIRON

A support (usually a bed of logs) for a vessel to take the bottom in large tidal areas to dry out and enable underwater repairs.

SHELL PLATING

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

RISE OF FLOOR

The amount by which the line of the outer bottom plating amidships rises above the base line, when continued to the moulded breadth lines at each side.

OYSTER BED

On the sea bottom where oysters breed.

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