Dublin Core
Identifier
1556
Title
Drum Contained Beacon (DCB) 24
Description
In 1991, the 4th order Fresnel lens was replaced by a type "DCB 24" (Drum Contained Beacon) rotating Aero Beacon. While originally designed for airport use, it is typical of replacements taking place in lighthouses nationwide. The DCB 24 uses a 1000 watt long life tungsten halogen lamp with the parabolic reflector mirror behind the lamp emitting a 2.5 million candlepower pencil beam.
The electric drive motor is mounted below the lamp canister drum and was adjusted to rotate the light to show as a characteristic single flash every 6 seconds. In 2007 it was changed to 9 seconds. The light has two ear-like baffles on either side of the drum to minimize backward reflections off the lantern room glass panels as it rotates.
The power to the beacon must be shut down for safety concerns when performing maintenance in the lantern room since the rotating baffles do not allow room for personnel. Beavertail light remains on continually 24 hours a day and as the drum rotates it appears to flash once in coincidence with its rotational speed.
The electric drive motor is mounted below the lamp canister drum and was adjusted to rotate the light to show as a characteristic single flash every 6 seconds. In 2007 it was changed to 9 seconds. The light has two ear-like baffles on either side of the drum to minimize backward reflections off the lantern room glass panels as it rotates.
The power to the beacon must be shut down for safety concerns when performing maintenance in the lantern room since the rotating baffles do not allow room for personnel. Beavertail light remains on continually 24 hours a day and as the drum rotates it appears to flash once in coincidence with its rotational speed.
Physical Object Item Type Metadata
Storage Location
Oil House