When a boat has two separate fins, instead of a centerboard or keel, they are referred to as bilge boards.

A device used to keep a line from slipping, such as a jamcleat.

A knot used to form a knob in the end of a line to prevent the end from running through a block or other narrow space.

Too heavy aloft.

A paint applied to the boat's bottom below the waterline which contains "poisons", such as copper, to inhibit the growth of marine life such as weeds or barnacles.

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

The tensile or compressive loading on the crosshead assembly with compressive piston rod loading on the outward stroke and tensile piston rod loading on the inward stroke.

The portion of a valve used to guide the disc.

The act of the U.S. Congress (1916) that created the U.S. Shipping Board to develop water transportation, operate the merchant ships owned by the government, and regulate the water carriers engaged in commerce under the flag of the United States. As of Ju ...

A unit of pressure used with vacuum pumps, equal to 1mm of mercury and 133.32 Pascal's.

When reciprocating compressors run, the moving parts such as pistons, rods, crossheads, connecting rods are repeatedly accelerated and retarded. These velocity changes set up pulsating inertia forces. The forces are of the first and second order. The firs ...

A type of journal bearing in centrifugal air compressors.

A large net with its mouth held open, towed by a trawler along the bottom to catch bottom fish.

A filter element so full of contaminants that no longer can pass rated flow without excessive pressure differential.

A flying bridge on top of a pilothouse or chart house.

An audible or visual discharge at a pressure slightly lower than the set pressure on a valve. Warns the operator that the valve is about to open.

A sudden burst of wind stronger than the current wind conditions.

A change in the wind direction.

A term used to cover all of the anchor gear.

Going toward the direction of the wind, by alternate tacks.