. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . iving, ami, what ismore, we can make the potential alternate with great rapidity,lioth of these results enal>le us now to pas> a luminous dischargethrough almost any vacua obtainal»le, and the Hehl of our inves-tigations is greatly cMended. Think we aN we mav, of all thepossible direction^ to (levclo]) a practiod illuniinant, the lin»* of 276 INVENTIONS OF NIKOLA TESLA. hi»;h vacua seems to ])e the most promisiiiir at present. But toreach extre
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . iving, ami, what ismore, we can make the potential alternate with great rapidity,lioth of these results enal>le us now to pas> a luminous dischargethrough almost any vacua obtainal»le, and the Hehl of our inves-tigations is greatly cMended. Think we aN we mav, of all thepossible direction^ to (levclo]) a practiod illuniinant, the lin»* of 276 INVENTIONS OF NIKOLA TESLA. hi»;h vacua seems to ])e the most promisiiiir at present. But toreach extreme vacua tlie appliances must be much more improved,and ultimate perfection will not be attained until we shall havedischarged the mechanical and perfected an electrical vacuumpump. Molecules and atoms can be thrown out of a bulb underthe action of an enormous potential : thia will be the principleof the vacuum pump of the future. For the present, we mustsecure the best results we can with mechanical appliances. Inthis respect, it might not be out of the way to say a few wordsabout the method of, and apparatus for, producing excessively. Fkj. 159. high degrees of exhaustion of which I have avaihd myself in thecourse of these investigations. It is very ju-obabh that other ex-perimenters have used similar arrangements ; but as it is possiblethat there may be an item (»f interest in their description, a fewremarks, which will render this investigation more complete,might be permitted. The aj)paratns is illustrated in a drawing shown in Iig. !)!>.8 represents a Sprengel })ump, which has been specially con-structed to better suit the work required. The 8to|>-cock whicli HIOU FREQUEXCT AND HIGH POTENTIAL CURRENTS. 277 is usually employed has been omitted, and instead of it a hollowstopper 6 has been fitted in the neck of the reservoir k. Thisstopper has a small hole h, through which the mercury descends ;the size of the outlet o being proj^erly determined with respectto the
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