Influence
It was observed that under some conditions the glass envelope would itself glow at the positive (anode) end. This glow was attributed to the transmission of a ray from the negative cathode at the opposite end of the device, and so were named cathode rays. William Crookes developed a modification of the Geissler tube into what is known as the Crookes tube to demonstrate and study these rays, later determined to be a stream of electrons. This device was further developed into the cathode ray tube with applications in electronics development and diagnosis, and in radar and television displays.
Geissler tubes have had a large impact on the development of many instruments and devices all of which use related vacuum and discharge principles.
- Xenon flash lamps (for flash photography),
- Xenon arc lamps (for automobile headlights),
- X-ray tubes,
- sodium vapor lamps of low and high pressure,
- "Neon" signs (both using visible light discharge from neon and other gases and indirectly through phospor excitation from ultraviolet light)
- Mercury vapor lamps,
- Mass spectrometry devices,
- Cathode ray tube (employed in the oscilloscope and later as a television, radar, and computer display device),
- Electrotachyscope (an early moving picture display device), and
- Fluorescent lamps.
Read more about this topic: Geissler Tube
Famous quotes containing the word influence:
“Standing armies can never consist of resolute robust men; they may be well-disciplined machines, but they will seldom contain men under the influence of strong passions, or with very vigorous faculties.”
—Mary Wollstonecraft (1759–1797)
“Who shall set a limit to the influence of a human being? There are men, who, by their sympathetic attractions, carry nations with them, and lead the activity of the human race. And if there be such a tie, that, wherever the mind of man goes, nature will accompany him, perhaps there are men whose magnetisms are of that force to draw material and elemental powers, and, where they appear, immense instrumentalities organize around them.”
—Ralph Waldo Emerson (1803–1882)
“To-day ... when material prosperity and well earned ease and luxury are assured facts from a national standpoint, woman’s work and woman’s influence are needed as never before; needed to bring a heart power into this money getting, dollar-worshipping civilization; needed to bring a moral force into the utilitarian motives and interests of the time; needed to stand for God and Home and Native Land versus gain and greed and grasping selfishness.”
—Anna Julia Cooper (1859–1964)