. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 2 BELL SYSTEM TECHNICAL JOURNAL ray, down the length of the tube. At the end of the tube is a screen of fluorescent materials, which shines brightly at the point where the ray strikes it. We can therefore see where the ray ends on the screen. Another pair of electrodes in the form of two plates P and Pi is intro- duced so that the cathode ray passes between them (Fig. 2). Now, D^s^p M'l'H —H|.|i|i|i[- Fig. 1—-Schematic of cathode ray tube. by a battery or otherwise, we
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 2 BELL SYSTEM TECHNICAL JOURNAL ray, down the length of the tube. At the end of the tube is a screen of fluorescent materials, which shines brightly at the point where the ray strikes it. We can therefore see where the ray ends on the screen. Another pair of electrodes in the form of two plates P and Pi is intro- duced so that the cathode ray passes between them (Fig. 2). Now, D^s^p M'l'H —H|.|i|i|i[- Fig. 1—-Schematic of cathode ray tube. by a battery or otherwise, we apply a voltage between the plates, so that one is positive with respect to the other. The electrons of the ray, being negative charges, are during their passage between the plates drawn toward the positive plate and emerge in a different direction because of the applied voltage. Similarly, a magnetic field applied by the magnet N-S, across the path of the ray and in the plane of the paper, as in Fig. 3, makes the ray emerge in a direction out from the. Fig. 2—Tube with electrostatic deflection. page. The amount of the deflection is a measure of the strength of the applied magnetic or electric field. We have, then, in this cathode ray a pointer which tells the magnitude of the field that deflects it. It is, furthermore, a pointer that is almost without mass and sluggish- ness ; it is almost not a material pointer. It can therefore follow varia- tions in the applied field that are very rapid, as we shall see presently. Because of this property the instrument has been used extensively for studying the electrical phenomena of such a range of subjects as power machinery, telephone apparatus, radio transmission and electric Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Tel
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
