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[2] A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, to produce ultraviolet and make a phosphor coating in the lamp glow.
The range lights replaced the Baileys Harbor Lighthouse in 1870 at a cost of $6,000. [8] They are approximately 980 feet (300 m) apart and aligned on a 340° bearing line to guide boats safely into the harbor. It was added to the National Register of Historic Places in 1989, as
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
Location: approaches to Green Bay, Wisconsin harbor: Coordinates: 1]: Tower; Constructed: 1935 [2]: Foundation: Concrete pier: Construction: Steel plate: Automated: 1979 [2]: Shape: white conical tower on cylindrical base: Light; Focal height: 72 feet (22 m): Lens: fourth order Fresnel lens: Range: 12 nautical miles (22 km; 14 mi): Characteristic: occ. red 4s: The Green Bay Harbor Entrance ...
The Baileys Harbor lighthouse is a lighthouse located near Baileys Harbor in Door County, Wisconsin. Construction of Baileys Harbor Lighthouse began in 1852 and in 1853 David Ward became the first lighthouse keeper. It was the third lighthouse constructed in Door County after the lighthouses on Rock Island and Plum Island. An 1866 inspection ...
The bulb is cared for by the Centennial Light Bulb Committee, a partnership of the Livermore-Pleasanton Fire Department, Livermore Heritage Guild, Lawrence Livermore National Laboratories, and Sandia National Laboratories. The Livermore-Pleasanton Fire Department plans to house and maintain the bulb for the rest of its life, regardless of length.