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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 ...
in
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
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 ...
. Originally intended for use as an
aerodrome beacon, it was also widely used in marine
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.
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''.
See also
*
Aerial lighthouse
An airway beacon (US) or aerial lighthouse (UK and Europe) was a rotating light assembly mounted atop a tower. These were once used extensively in the United States for visual navigation by airplane pilots along a specified airway corridor ...
*
Aerodrome beacon
*
Airway beacon
An airway beacon (US) or aerial lighthouse (UK and Europe) was a rotating light assembly mounted atop a tower. These were once used extensively in the United States for visual navigation by airplane pilots along a specified airway corridor. ...
References
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*
;Specific
External links
photos of a DCB-36 installationat the Massey Air Museum
Lighting
Lighthouse fixtures
Air traffic control
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