A small buoy that is used to mark the position of an anchor. It is attached to the base or crown of an anchor and can be used to recover the anchor if it has to be cast adrift, or to trip it if it becomes wedged.

The lower yard on a mizzen mast of a square-rigged ship.

(1) A small wooden cask in which grog was carried. (2) A type of marine steam reciprocating engine where two engines were used together on the same propeller shaft.

Abbreviation for "Consumption Entry." The process of declaring the importation of foreignmade goods for use in the United States.

A rail car without a roof and walls.

A device for separating solids or suspended particles in the air before they enter the air intake of the compressor and reduce intake noise as on reciprocating compressors through a silencing chamber in the filter housing.

A liquid piston compressor is a rotary compressor in which a vaned rotor revolves in an elliptical casing, with the rotor spaces sealed by a ring of liquid rotating with it inside the casing.

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

Forcing material into the seams of the planks in a boat's deck or sides to make them watertight; the material itself. Oakum was once the material used for this purpose, and was then sealed with hot pitch to prevent it from rotting. Today there are polymer ...

A metal pin by which the plating and other parts of iron and steel vessels are joined. Rivets are known by their heads, such as: Flush, pan, snap, plug, tap, countersunk, mushroom, and swollen neck.

A person or firm who transacts all business in a port on behalf of shipowners or charterers. Also called shipping agent; agent.

A knot with two half hitches loops - on the standing part of the line.

A sailing vessel dead in the water due to lack of wind (not moving).

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 navigational aid used in the United States and Canada to mark a channel. Green triangular daymarks should be kept on the left when returning from a larger to smaller body of water.

A hand held pneumatic tool. Designed for light demolition work, digging, making holes etc.

The portion of a valve used to guide the disc.

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

A line attached to the crown of an anchor and used to help free it in the event it becomes fouled.