System of transmission of electrical energy.
description: Description -. SYSTEII 0F TRAB IIIIIIIIIIIIIIIIIIIIIIIII Y. ' d 20, I90 I N. TEN-A. Patenfe ylfiar 0 I To (all whom it may concern: Be it known that I, NIKOLATESLA, acit iY-en UNITED STATES PATENT OFFICE. NIKOLA TESLA, OF NE\V YORK, N. Y. SYSTEM OF TRANSMISSION OF ELECTRICAL ENERGY; SPECIFICATION forming part of Letters Patent No. 645,576, dated March 20, 1900. Application filed September 2, 1897. Serial No. 650,343. (No model.) I of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Systems of Transmission of ElectricalEnergy, of which the following is a specification, reference being had to the drawing accompanying and forming a part of thesame. It has been well known heretofore that by rarefying the air inclosed in a vesselits insulating properties are impaired to such an extent that it becomes what may be considered as a true conductor, although one of admittedly very high resistance. The practical information in this regard has been derived from observations necessarily limited in their scope by the character of the apparatus or means heretofore known and the quality of the electrical effects producible. thereby. Thus it has been shown by William (-rookes in his classical researches, which have so far served as the chief source of knowledge of this subject, that all gases behave as excellent insulators until rare lied to a point'correspon din g to a barometric pressure of about seventyfive millimeters, and even at this Very low pressure the discharge of a high-tension induction-coil passes through only a part of the attenuated gas in the form of a luminous thread or are, a still further and considerable diminution of the pressure being required to render the entire mass of the gas inclosed in a vessel conducting. While this is true in every particular so long as electromotive or current impulses such as are obtainable with ordinary forms of apparatusare employed, I have found that n…
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