Nikola Tesla U.S. Patent 645,576 - System of Transmission of Electrical Energy Patent Wrapper Page 60

178 four 1-6-1900 about two hundredths of a microfarad, and was charged from a generator of alternating currents of fifty thousand volts pressure and discharged, by means of a mechanically operated break, five thousand times per second through the primary C. The latter consisted of a single turn of stout, stranded cable, of inappreciable eight 12-30-resistance 12-30-99 resistance and of an inductance of about sixteen thousand centimeters, the diameter of the loop being very nearly two hundred and forty-four centimeters. The total inductance of the primary ten 1-6-1900 circuit was approximately twenty thousand centimeters, so that the primary circuit vibrated generally, according to adjustment, from two hundred and thirty thousand to two hundred and fifty thousand times per second. The high-tension coil A, in the form. 6/1= of a flat spiral, was composed of fifty turns of heavily insulated. wound 1-6-1900 Cable No. 8, would in one single layer, the turns beginning close to the primary loop and ending near its center. The outer end of the secondary or high tension coil A was connected to the ground as illustrated, while the free end was led to a terminalplaced in stratum through which the energy was to be transmitted, the rarefied air which was contained in an insulating tube of a length of fifty feet or more, within which a barometric pressure, varying from about one hundred and twenty to one hundred and fifty millimeters was maintained by means of a mechanical suction pump. the The receiving transformer was similarly proportioned, the ratio of conversion being reciprocal of that of the transmitter, and the primary high tension coil A' was connected as illustrated, with the end near the low tension coil c' to the ground, and with the free end to a wire or plate, likewise placed in the rarefied air stratum, and at the distance named from the -11This page retyped from microfilm for better readability - Ed.