Electric Lamps And Electric Lighting a Course of Four Lectures On Electric Ill
Electric Lamps And Electric Lighting a Course of Four Lectures On Electric Ill
John Ambrose Fleming
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If one of the con- ductors has a large surface if, for instance, it is a brass plate and the other conductor is not a very good conductor as, for example, a wooden ball or knob then in the dark we find a form of glow discharge taking place between the ball and the plate, which is called a brush discharge. It has a violet, broom-shaped glow of light, and Sir Charles Wheatstone, on examining it by reflection in a rapidly revolving mirror, showed that it consisted of a series of very rapid electri...c discharges between the air particles. It is generally accompanied by a slight hissing sound. This form of brush discharge occurs in nature under some conditions, and is known by the name of St. Elmo's Fire. In the high Alps, when in the neighbourhood of a thunder- storm, travellers have often observed these whizzing brushes of purple light proceeding from their axes and alpenstocks, and from sharp-pointed rocks; and a similar phenomenon ELECTRIC ABC LAMPS. 129 has been seen proceeding from the masts and yardarms of ships under certain electrical conditions of the atmo- sphere.
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