UNMANNED MACHINERY SPACES

A space where alarm bells are installed on the bridge of a ship to trace or rectify any machinery faults. The computerized devices will report any fault immediately it appears and the engineers on board can attend to the necessary ramifications.

unmanned_machinery_spaces bridge space ship alarm fault on_board trace

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PONTOON BRIDGE

A fixed floating bridge supported by pontoons.

pontoon_bridge fixed bridge floating

PLATE GIRDER BRIDGE

A fixed bridge consisting, in its simplest form, of two flange plates welded to a web plate in the overall shape of an I.

plate_girder_bridge plate web shape fixed bridge two fixed_bridge

PIVOT BRIDGE

A bridge in which a span can open by pivoting about a vertical axis.

pivot_bridge open span bridge vertical can

PETTIT TRUSS

A bridge truss in which the panel is subdivided by a short diagonal and a short vertical member, both intersecting the main diagonal at its midpoint.

pettit_truss bridge panel truss vertical main

PEDESTAL

1. The support for a column. 2. A metal support carrying one end of a bridge truss or girder and transmitting any load to the top of a pier or abutment. 3. See blanking level. 4. A supporting part or the base of an upright structure, such as a radar antenna.

pedestal pier support part girder bridge base end truss load radar top metal

ORTHOTROPIC DECK

A bridge deck constructed typically of flat steel plate and longitudinal and transverse ribs; functions in carrying traffic and acting as top flanges of floor beams.

orthotropic_deck plate traffic floor bridge flat transverse top longitudinal deck

MOVABLE BRIDGE

A bridge in which either the horizontal or vertical alignment can be readily changed to permit the passage of traffic beneath it. Often called drawbridge (an anachronism).

movable_bridge traffic horizontal bridge passage alignment vertical can drawbridge

LENARD SPIRAL

A type of magnetometer consisting of a spiral of bismuth wire and a Wheatstone bridge to measure changes in the resistance of the wire produced by magnetic fields and as a result of the transverse magnetoresistance of bismuth.

lenard_spiral magnetic magnetoresistance bridge transverse resistance wire measure magnetometer

KELVIN BRIDGE

A specialized version of the Wheatstone bridge network designed to eliminate, or greatly reduce, the effect of lead and contact resistance, and thus permit accurate measurement of low resistance. Also known as double bridge; Kelvin network; Thomson bridge.

kelvin_bridge bridge kelvin measurement contact low network lead

ICE APRON

A wedge-shaped structure which protects a bridge pier from floating ice.

ice_apron pier bridge floating structure bridge_pier

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