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THE TESLA KOTATING MAGNETIC FIELD. MOTORS WITH CLOSED CONDUCTORS. SYNCHRONIZING MOTORS. KOTATING FIELD TRANSFORMERS

 THE TESLA KOTATING MAGNETIC FIELD. MOTORS WITH CLOSED CONDUCTORS. SYNCHRONIZING MOTORS. KOTATING FIELD TRANSFORMERS. THE best description that can be given of what he attempted, and succeeded in doing, with the rotating magnetic field, is to be found in Mr. Tesla's brief paper explanatory of his rotary cur- rent, polyphase system, read before the American Institute of Electrical Engineers, in New York, in May, 1888, under the title " A New System of Alternate Current Motors and Trans- formers." As a matter of fact, which a perusal of the paper will establish, Mr. Tesla made no attempt in that paper to de- scribe all his work. It dealt in reality with the few topics enu- merated in the caption of this chapter. Mr. Tesla's reticence was no doubt due largely to the fact that his action was gov- erned by the wishes of others with whom lie was associated, but it may be worth mention that the compiler of this volume who had seen the motors running, and who was then ...
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A New System of Alternating Current Motors

A New System of Alternating Current Motors Introduction : In the late 19th and early 20th centuries, the development of electrical engineering revolutionized industries, transportation, and daily life. Central to this transformation was the discovery and utilization of alternating current (AC) motors. These motors, as opposed to direct current (DC) motors, offered several advantages, including increased efficiency, longer transmission distances, and more straightforward regulation. In this article, we will delve into the historical context of AC motors, the key contributions of various inventors, and the development of a new system of alternating current motors that paved the way for the modern electrical era. Historical Context: The idea of utilizing electrical power for practical applications was first demonstrated by Michael Faraday in the early 1830s when he discovered electromagnetic induction. Faraday's work laid the foundation for the understanding of the relationship betw...
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FREQUENCY SELECTION.

 FREQUENCY SELECTION. 1. Prior to selecting frequencies for a radio circuit, thought must be given as to what type of antenna will be used. Often, during displacement or during an alert, at least two types of antennas will be used -- a whip while moving; a doublet or suitable compromise antenna while mobile at a halt. Antenna selection will determine the choice of frequency, not the other way around. Looking at the various Immediate Sky-Wave Distance (ISD) charts, page 125 to page 141 (we will use column 5 on the charts) for various antennas, we see that the most reliable antenna is a doublet with reliability dropping until we reach the poorest antenna -- the whip. We also see on the ISD charts that for the same distance, the frequency increases with each type of antenna, with the whip having the highest frequency. What conclusions can we draw from these comparisons? First, we must have two frequencies for sky wave use -- a day and a night frequency. Also, when forced to use a whip...
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