The Bell System Technical Journal, 1932, Vol. 11: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication; Table of Contents and Index (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from The Bell System Technical Journal, 1932, Vol. 11: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication; Table of Contents and Index

The cathode ray oscillograph, since its invention by Braun, has developed along three lines. The major types of tubes are the high voltage tubes with a fluorescent screen, the high voltage tubes with internal photographic equipment, and the low voltage tubes. This paper follows the structural development of commercial tubes. The operation of the tubes is discussed, from the standpoint of both theory and practice, with particular reference to the low voltage type of tube. Numerous examples are given of the applications of the tubes to problems in science and engineering.

N our complicated life, we find that we need a great many aids to our primary sense organs. The processes of the modern world demand that we make correct estimates of things that are too large or too small, too intense or too feeble, for our poor senses. We have balances to give us the weight of masses too heavy for us to lift or too small to be felt. Telescopes enable us to see far-off objects, micro scopes very small objects. Our ears are supplemented by telephones that put us within earshot of almost all the civilized world. For elec tric currents we have ammeters to measure currents so large as to destroy us in a second, and galvanometers that measure currents far too small for us to feel as a shock. Taste and smell have not yet been supplied with artificial aids, but that may come some day.

For recording long times we have clocks and calendars; for making a record of happenings that take place in a time too short for us to think of, we use oscillographs.

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