Updating globe ligths

GE’s efforts came to fruition with the invention of a tungsten-based filament.

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Updating globe ligths

When a high voltage was applied between the electrodes, the inside of the tube lit up with a glow discharge.

By putting different chemicals inside, the tubes could be made to produce a variety of colors, and elaborate Geissler tubes were sold for entertainment.

That tube was evacuated by the highly effective mercury vacuum pump created by Hermann Sprengel. But the Crookes tube, as it came to be known, produced little light because the vacuum in it was too good and thus lacked the trace amounts of gas that are needed for electrically stimulated luminescence.

Research conducted by Crookes and others ultimately led to the discovery of the electron in 1897 by J. One of the first mercury vapor lamps invented by Peter Cooper Hewitt, 1903.

More important, however, was its contribution to scientific research.

One of the first scientists to experiment with a Geissler tube was Julius Plücker who systematically described in 1858 the luminescent effects that occurred in a Geissler tube.

It was similar to a fluorescent lamp without the fluorescent coating on the tube, and produced greenish light. While Becquerel was interested primarily in conducting scientific research into fluorescence, Thomas Edison briefly pursued fluorescent lighting for its commercial potential.

He invented a fluorescent lamp in 1896 that used a coating of calcium tungstate as the fluorescing substance, excited by X-rays, but although it received a patent in 1907, it was not put into production.

Fluorescence of certain rocks and other substances had been observed for hundreds of years before its nature was understood.

By the middle of the 19th century, experimenters had observed a radiant glow emanating from partially evacuated glass vessels through which an electric current passed.

Little more was done with this phenomenon until 1856 when German glassblower Heinrich Geissler created a mercury vacuum pump that evacuated a glass tube to an extent not previously possible.

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