The electro-therapeutic guide, or, A thousand questions asked and answered . penetrating rays to pass through. What are cathode rays and electrons? Cathode ray is the name applied to the stream of particles known topass from the negative to the positive electrode inside a vacuum tube,when energized by a current of high voltage electrification. This streamof iufinitessimal particles, constituting the cathode ray, and which are as-sumed to be the ultimate division of matter, is composed of what are termedelectrons, and are estimated to travel at the rate of 70,000 miles per minute. 150 THE KLKCT
The electro-therapeutic guide, or, A thousand questions asked and answered . penetrating rays to pass through. What are cathode rays and electrons? Cathode ray is the name applied to the stream of particles known topass from the negative to the positive electrode inside a vacuum tube,when energized by a current of high voltage electrification. This streamof iufinitessimal particles, constituting the cathode ray, and which are as-sumed to be the ultimate division of matter, is composed of what are termedelectrons, and are estimated to travel at the rate of 70,000 miles per minute. 150 THE KLKCTRO-THERAPEUTIC GUIDE What is meant by the term vacattm? Vacuum, in electro-physics is that condition of the attenuation of theatmosphere inside of a tube, which is about the one millionth of the densityof the outside air, and which is the best condition known for the genera-tion of the X-rays. What is fluorescence? Fluorescence is a property possessed by certain crystals of glowing,when acted upon by the X-ray in the absence of light. What is a fittoroscopet and how used?. A fluoroscope is a funnel or pyramidal shaped box, in the base ofwhich is set a screen of some fluorescent chemical, so that the light is ex-cluded, and the shadows of some object intervened between it and the tubewill be projected upon the fluorescent screen, and thus become visible tothe operator. What is meant by anode, cathode, anti-cathode, target, focal point? The anode is the electrode in a vacuum tube to which is connected thepositive pole from the electric generator. It is flat, and usually composedof platinum, and is fixed at an angle of 45 degrees to the long axis of thetube, and is usually the target, or point of impact, on which the stream ofthe cathode rays are concentrated, at what is known as the focal point, bymeans of a concave disc of aluminum, which constitutes the cathode, whichis the electrode to which the negative pole of the electric generator is con-nected. Sometimes another electrode
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