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A 175-watt mercury-vapor light approximately 15 seconds after starting. A closeup of a 175-W mercury-vapor lamp. The small diagonal cylinder at the bottom of the arc tube is a resistor which supplies current to the starter electrode. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce ...
Peter Cooper Hewitt (May 5, 1861 – August 25, 1921) was an American electrical engineer and inventor, who invented the first mercury-vapor lamp in 1901. [1] Hewitt was issued U.S. patent 682,692 on September 17, 1901. [2] In 1903, Hewitt created an improved version that possessed higher color qualities which eventually found widespread ...
Cooper-Hewitt had not been the first to use mercury vapor for illumination, as earlier efforts had been mounted by Way, Rapieff, Arons, and Bastian and Salisbury. Of particular importance was the mercury-vapor lamp invented by Küch and Retschinsky in Germany. The lamp used a smaller bore bulb and higher current operating at higher pressures.
In 1980, the annual operating cost for the average incandescent lamp was $280; for mercury vapor lamps, it was $128; and for low-pressure sodium vapor lamps, it was $60 a year. [1] Meanwhile, high-pressure sodium vapor lamps cost only $44 a year to operate, with a standard life expectancy of 15,000 hours, which also helped to lower labor and ...
He applied for a patent for a fluorescent lamp with Friedrich Meyer and Hans J. Spanner on December 10, 1926, which led to U.S. patent 2,182,732. The patent was later purchased by the General Electric Company, which also licensed his patent on the high-pressure mercury-vapor lamp .
He developed the mercury vapor lamp (also called "Arons' tube"), which was later marketed by AEG as "Dr. Arons' mercury vapor lamp". In 1890 he became a Privatdozent at the Friedrich-Wilhelms-Universität Berlin (now Humboldt University of Berlin). A year later he became the First Assistant in the Physics department, but resigned from this ...
The outer bulb may be clear or coated with a phosphor. In either case, the outer bulb provides thermal insulation, protection from ultraviolet radiation, and a convenient mounting for the fused quartz arc tube. In 1901, Peter Cooper Hewitt invented and patented the mercury-vapor lamp. [79] 1901 Assembly line. 1913 Ford Model T assembly line ...
Germicidal lamps are simple low-pressure mercury vapor discharges in a fused quartz envelope. Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. Typically, such lamps use a noble gas (argon, neon, krypton, and xenon) or a mixture of these gases.