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Concept
Bridge (nautical)
Summary
A bridge, also known as a pilothouse or wheelhouse, is a room or platform of a ship from which the ship can be commanded. When a ship is under way, the bridge is manned by an officer of the watch aided usually by an able seaman acting as a lookout. During critical maneuvers the captain will be on the bridge, often supported by an officer of the watch, an able seaman on the wheel and sometimes a pilot, if required.
There are many terms for parts of a ship with functions similar to a bridge. Depending upon the design and layout of a ship, some of these terms may be interchangeable.
Traditionally, sailing ships were commanded from the quarterdeck, aft of the mainmast, where the ship's wheel was located (as it was close to the rudder). A wheelhouse was a small enclosure around the ship's wheel on the quarter deck of sailing ships. On modern ships the wheelhouse or pilothouse refers to the bridge of smaller motor vessels, such as tugs.
With the arrival of paddle steamers, engineers required a platform from which they could inspect the paddle wheels and where the captain's view would not be obstructed by the paddle houses. A raised walkway, literally a bridge, connecting the paddle houses was therefore provided. When the screw propeller superseded the paddle wheel, the term "bridge" survived.
Traditionally, commands would be passed from the senior officer on the bridge to stations dispersed throughout the ship, where physical control of the ship was exercised, as technology did not exist for the remote control of steering or machinery. Helm orders would be passed to an enclosed wheel house, where the coxswain or helmsman operated the ship's wheel. Engine commands would be relayed to the engine officer in the engine room by an engine order telegraph that displayed the captain's orders on a dial. The engine officer would ensure that the correct combination of steam pressure and engine revolutions were applied. Weatherproof pilot houses supplanted open bridges so that the pilot, who was traditionally the ship's navigating officer, could issue commands from shelter.
Official source
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