File:Induction coils - how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery (14754587791).jpg

Identifier: inductioncoilsho00schn (find matches)
Title: Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery
Year: 1901 (1900s)
Authors: Schneider, Norman H. (Norman Hugh)
Subjects: Induction coils Radiography X-rays Radiography
Publisher: New York : Spon & Chamberlain London : E. & F.N. Spon
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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increasing the intensity of the spark,the metal at B glows with extreme brill-iancy, and melts if the intensity be carriedtoo far. CHAPTER VIII. ROTATING EFFECTS. Although the luminous discharges inthe exhausted tubes are extremely beauti-ful, yet the effect is indescribably enhancedwhen the tubes are rotated. Gassiots starwas the name given to the earliest exhibitof a rotating tube carrying a luminous dis-charge, owing to the curious phenomenonensuing from the interruptions of the spark.As the human retina is only capable of re-taining an impression for a fraction of asecond, and as the tube is only momen-tarily luminous during the passage of thespark, the effect of the revolving tube isthat of a series of such arranged as theradii of a circle, the number apparent,being governed by the rapidity of rotationand the rate of interruption of the current. 154 Rotating Effects. Fig. 49 represents a form of rotatingwheel which is easily made, and yet sus-ceptible of many novel and attractive
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W Fig. 49. effects. Such a wheel, placed in a storewindow, would undoubtedly attract manypersons by the beautiful variations of col- Rotating Effects. 155 ored figures which it presents while inmotion. And once a crowd is collectedand its attention attracted to one spot, thecapabilities of advertising the goods onsale are apparent. A pasteboard or light wooden disk D^3 feet in diameter or over, is mounted ona shaft, 5, operated by an electric motoror such power as may be attainable. Uponits surface are mounted the tube-holdersT T T T, connected, as shown, by wiresleading from the secondary of the Ruhm-korff coil. Starting at the shaft S, the cir-cuit runs to the first tube-holder, wherethe continuity of the wire is broken toallow of the attachment of the vacuumtube. From the first tube-holder the wireruns in turn to each of the other threetube-holders, terminating at R^ where itpasses through a hole to a metal ring onthe back of the disk shown by the dottedcircle. This ring and the sh

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