. Dental and oral radiography : a text book for students and practitioners of dentistry . ore may be defined as that formof radiation which emanates from a highly ex-hausted tube when an electric current of high ten-sion is passed through the tube. The object ofthe vacuum tube is to establish a medium in whichall source of resistance is removed, so that theelectric current may excite the exquisitely rapidvibrations necessary to produce the phenomenondesired, the electric current being the source ofexcitation. The radiation thus produced gives neither heatnor light, nor can it be deflected, ref
. Dental and oral radiography : a text book for students and practitioners of dentistry . ore may be defined as that formof radiation which emanates from a highly ex-hausted tube when an electric current of high ten-sion is passed through the tube. The object ofthe vacuum tube is to establish a medium in whichall source of resistance is removed, so that theelectric current may excite the exquisitely rapidvibrations necessary to produce the phenomenondesired, the electric current being the source ofexcitation. The radiation thus produced gives neither heatnor light, nor can it be deflected, reflected, or po-larized. In fact, it can only be recognized byits effect upon the photographic plate and uponsuch chemicals as Willemite, Calcium, and Tung-state, which floresce or glow under its influence. The Discovery of the X-Ray The x-ray was discovered in 1895 by WilliamConrad Rontgen, Professor of Physics, at the 20 DENTAL AND ORAL RADIOGRAPHY Royal University of Wiirzburg, in discovery marking as it did a distinct epochin the Science of Medicine, was received by the. Fig. Conrad Rontgen. world with incredulity and amazement, for itsreported possibilities savored almost of the new ray had been discovered by means of NATURE OF X-RAY AND ITS DISCOVERY 21 which it was possible to look through opaque sub-stances. While it fell to the lot of Prof. Eontgen to makethis discovery, there is no doubt but what otherexperimenters in the field of physics, unconscious-ly produced this same ray. In fact, its discoverywas made possible by the work of other scientistswho preceded Eontgen and laid the foundation forits advent. Of these Michael Faraday was the pioneer. In1831 he discovered electric magnetic induction,which made possible the induction coil and theother electrical machines utilized to generate cur-rents of great potential. As early as 1838 he con-ducted a series of experiments to determine theeffect of electrical discharges upon rarified gases,a
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