To temporarily stop all movement of a line through a block by placing the hauling part across the sheave of the block. This jams the sheave and holds it tight, and a pull on the hauling part will release it.

That part of the water which is diverted from the main stream of a current and as a result flows in the opposite direction.

Railcars grouped in a train by destination so that segments (blocks) can be uncoupled and routed to different destinations as the train moves through various junctions. Eliminates the need to break up a train and sort individual railcars at each junction.

A written contract between the owner of a vessel and the person desiring to employ the vessel (charterer); sets forth the terms of the arrangement such as duration of agreement, freight rate and ports involved in the trip.

The location from which the boat is steered, usually in the middle or at the stern of the boat.

On a wooden vessel, the outermost deck plank covering the gunwale. also called Covering Board

A stationary element between stages of a multistage centrifugal compressor. It may include guide vanes for directing the flowing medium to the impeller of the succeeding stage. in conjunction with an adjacent diaphragm, it forms the diffuser surrounding t ...

Placing a container where required to be loaded or unloaded.

A combination of one or more blocks and the associated tackle necessary to give a mechanical advantage. Useful for lifting heavy loads.

A metal fitting with an arm that uses a spring to close automatically when connected to another object.

Another term for a marine railway.

A single outlet or limited number of outlets in a building used to connect tools or equipment to the air system.

Scoop like devices used to direct air into and ventilate a boat.

Flapping (of sails)

To bleed is the operation of draining any water out of a buoy which may have seeped inside after long use at sea.

The wind direction indicator on the masthead.

To ease away slowly, as in a line, sheet, or falls of a tackle.

Waterproof clothing.

The point (speed of sound) at which air flow through an orifice can not increase regardless of pressure drop.

Froth of sea foam.