About this Item
Tesla, Nikola. "On Light and Other High Frequency Phenomena" in "The Electrical World", NYC, W.J. Johnston & Co., 1893. This is volume 21, issue 22, 5 June 1893, pp 407-416 in the issue of pp 401-422. This is the full weekly issue, extracted cleanly from a larger bound volume. There is a small old fold on the bottom right corner first page that has been repaired with Japan tissue tape. VG condition. [++] This is a very long article for "Electrical World", and runs about 20,000 words. [++] The lecture is the same as that given at the Franklin Institute on 21 February 1893 and also at the National Electric and Light Association, St. Louis, 1 March 1893. "(Tesla) presents his attempts to develop a wireless lighting system based on near-field inductive and capacitive coupling."--TeslaUniverse site. [++] "Brilliantly worded, comprehensive, and strikingly illustrated was a lecture delivered by Mr. Nikola Tesla, of which a report has just reached us."--Nature, 8 June 1893. 48, 136 140, shortened version. Another version of the paper appears later in July 1893 in the "Journal of the Franklin Institute" (vol 136/1). [++]"What Tesla described in this lecture should be taken to be the foundation of radio engineering, since it embodied the following principles and ideas of fundamental importance, namely: the principle of adjusting for resonance to get the maximum sensitivity in a selective reception, inductive link between the driver and the tank circuit, an antenna circuit in which the antenna appears as a capacitive load." -- "Nikola Tesla and his Contributions to Radio Development", in History of Wireless, by Tapan K. Sarkar, Robert J. Mailloux, Arthur A. Oliner, 2006; chapter 5. Wiley-IEEE Press. [++]"In February 1893 Tesla delivered a third lecture on high-frequency currents before the Franklin Institute in Philadelphia and repeated it in March at the National Electric Light Association in St. Louis. In the first part of the lecture he described a method of conversion of low frequency AC or DC current into high-frequency currents, all based on using spark gap discharge. Just as in the previous two lectures he performed again many experiments with high frequency currents and various resonant circuits, illustrating that the current can pass through an open circuit consisting of a coil connected to a terminal of a generator and an insulated plate. Today specialists can easily build circuits used in these experiments but in 1893 they were fascinating and novel. The most significant part of this lecture refers to a system for transmitting intelligence or perhaps power, to any distance through the earth or intervening medium ." [++] Sarkar then quotes Tesla from the lectures: On wireless energy transmission, Tesla made the following remark in the demonstration of high frequency driven motors by a single wire: 'It is quite possible, that such hot wire motors, as they might be called, could be operated by conduction through the rarefied air at considerable distances. Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of air are rarefied, To reach a number of miles into space requires the overcoming of difficulties of a merely mechanical nature. There is no doubt that with the enormous potentials obtainable by the use of high frequencies and oil insulation luminous discharges might be passed through many miles of rarefied air, and that, by thus directing the energy of many hundreds or thousands of horse-power, motors or lamps might be operated at considerable distances from stationary sources'. [++] "Before passing on to consider the final phase of wireless communication, as represented by Marconi, mention must be made of one other pioneer, Tesla, who worked perhaps in a less spectacular manner than those who gained a certain amount of publicity." WRITE for full description.
Seller Inventory # ABE-1677292755693
Contact seller
Report this item
