Peter Cooper Hewitt’s Followers (2)

Peter Cooper Hewitt

Born

in New York City, New York, The United States

May 05, 1861

Died

August 25, 1921

Website

http://en.wikipedia.org/wiki/Peter_Cooper_Hewitt

Genre

Science, Engineering, Invention

Influences

Elmer Sperry ...more

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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. Hewitt was issued U.S. patent #682692 on September 17, 1901. In 1903, Hewitt created an improved version that possessed higher colour qualities which eventually found widespread industrial use.

Hewitt was born in New York City, the son of New York City Mayor Abram Hewitt and the grandson of industrialist Peter Cooper. He was educated at the Stevens Institute of Technology and the Columbia University School of Mines.

In 1901 he invented and patented a mercury vapor lamp; a gas discharge lamp that used mercury vapor produced by passing current through liquid mercury. His first lamps had to be s 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. Hewitt was issued U.S. patent #682692 on September 17, 1901. In 1903, Hewitt created an improved version that possessed higher colour qualities which eventually found widespread industrial use.

Hewitt was born in New York City, the son of New York City Mayor Abram Hewitt and the grandson of industrialist Peter Cooper. He was educated at the Stevens Institute of Technology and the Columbia University School of Mines.

In 1901 he invented and patented a mercury vapor lamp; a gas discharge lamp that used mercury vapor produced by passing current through liquid mercury. His first lamps had to be started by tilting the tube to make contact between the two electrodes and the liquid mercury; later he developed the inductive ballast to start the tube. The efficiency was much higher than incandescent lamps but the emitted light was of a bluish-green unpleasant color, which limited its practical use to specific professional areas, like photography where the color was not an issue at a time where films were black and white. For space lighting use, the lamp was frequently augmented by a standard incandescent lamp. The two together provided a more acceptable color. Later in the 1930s a fluorescent coating (phosphor) was added to the inside of the tube at General Electric, which produced more pleasing white light when it absorbed the ultraviolet light from the mercury. This was the fluorescent lamp, which is now one of the most widely used lamps in the world.

In 1902 Hewitt developed the mercury arc rectifier, the first rectifier which could convert alternating current power to direct current without mechanical means. It was widely used in electric railways, industry, electroplating, and high-voltage direct current (HVDC) power transmission. Although it was largely replaced by power semiconductor devices in the 1970s and 80s, it is still used in some high power applications.

In 1907 he developed and tested an early hydrofoil. In 1916, Hewitt joined Elmer Sperry to develop the Hewitt-Sperry Automatic Airplane, one of the first successful precursors of the UAV. ...more

Combine Editions
Peter Cooper Hewitt’s books

Average rating: 3.17 · 12 ratings · 1 review · 3 distinct works

	Kenya Cowboy: A Police Officer's Account of the Mau Mau Emergency 3.14 avg rating — 7 ratings — published 2001 — 9 editions	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	Thunderbirds: The Junior Novel by Stephen D. Sullivan (Goodreads Author), Peter Cooper Hewitt, Namrata Tripathi 3.20 avg rating — 5 ratings — published 2004	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars
	ORIGINAL PATENT APPLICATION NUMBER 25,406 FOR AN IMPROVED METHOD OF AMPLIFYING VARIATIONS OF ENERGY IN ELECTRIC CIRCUITS 0.00 avg rating — 0 ratings — published 1904	Error rating book. Refresh and try again. Rate this book Clear rating 1 of 5 stars 2 of 5 stars 3 of 5 stars 4 of 5 stars 5 of 5 stars

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