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Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.
A jumping wire is a wire cable stretched between the bow and stern of a submarine, via the conning tower or periscope standards. Its purpose is to allow the submarine to pass under nets and other marine defences, without the obstruction snagging on the vessel's superstructure , the wire causing the net to ride up and over the top of the submarine.
Stitch and glue is a simple boat building method which uses plywood panels temporarily stitched together, typically with wire or zip-ties, and glued together permanently with epoxy resin. This type of construction can eliminate much of the need for frames or ribs. [ 1 ]
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European Siren for fire detection system. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.
A motor scooter's front with an impractical number and variety of headlamps, added for decorative purposes and characteristic of Mod culture. A headlamp is a lamp attached to the front of a vehicle to illuminate the road ahead.
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