An aerobeacon is a light assembly used to create a fixed or flashing signal visible over long distances. It consists of a high intensity electric lamp mounted with a focusing device in a cylindrical housing, which usually is rotated on a vertical axis by an electric motor. The sweep of the narrow beam thus produced gives the flashing effect. Aerobeacons were originally developed for aviation use, mostly as aerodrome beacons, but they also saw extensive use in

lighthouse A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mar ...

s. They were far less expensive to manufacture and maintain than classic glass

Fresnel lens A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships." The design allows the c ...

es, and much more durable; they could be mounted and exposed to the weather. Historic models include the DCB-24, which used a single parabolic reflector; the DCB-224, a double-beamed version of the DCB-24; and the DCB-36, which used a system of plastic Fresnel type lenses. Manufacturers included

Carlisle & Finch Carlisle & Finch is a manufacturer of nautical equipment founded in 1893 or 1894 in Cincinnati, Ohio, where, , it still has its headquarters. The company's main products through its entire history have been searchlights, mostly for marine applic ...

Cincinnati Cincinnati ( ) is a city in the U.S. state of Ohio and the county seat of Hamilton County. Settled in 1788, the city is located at the northern side of the confluence of the Licking and Ohio rivers, the latter of which marks the state line wit ...

and the Crouse-Hinds Company in

Syracuse, New York Syracuse ( ) is a City (New York), city in and the county seat of Onondaga County, New York, Onondaga County, New York, United States. It is the fifth-most populous city in the state of New York following New York City, Buffalo, New York, Buffa ...

. Aerobeacons have replaced fragile glass Fresnel lenses in many lighthouses and are still widely used in other applications.

DCB-224

The model DCB-224 is a high-power

spotlight Spotlight or spot light may refer to: Lighting * Spot lights, automotive auxiliary lamps * Spotlight (theatre lighting) * Spotlight, a searchlight * Stage lighting instrument, stage lighting instruments, of several types Art, entertainment, an ...

designed and built by

. Originally intended for use as an aerodrome beacon, it was also widely used in marine

s. Depending on the type of bulb installed, the beam could be seen for . The unit consists of a 25-inch aluminum housing with a parabolic reflector. An electric motor and gearbox drives the optical unit's rotation. They can optionally be fitted with a

CG-2P An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist. The common design elements are an array of two o ...

automatic bulb changer An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist. The common design elements are an array of two o ...

. The letters ''DCB'' stand for ''Directional Code Beacon''.

References

* * * ;Specific

External links

photos of a DCB-36 installation
at the Massey Air Museum Lighting Lighthouse fixtures Air traffic control {{aviation-stub

DCB-224

See also

References

External links