large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb_199
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb
English
12904
Others studied this glow and finally the German physicist Eugen Goldstein (1850 1931) decided in 1876 that there were rays of some sort beginning at the wire attached to the negatively charged cathode and ending at the part of the tube opposite the cathode. He called them "cathode rays". OTHERS STUDIED THIS GLOW AND FINALLY THE GERMAN PHYSICIST EUGENE GOLDSTEIN EIGHTEEN FIFTY NINETEEN THIRTY ONE DECIDED IN EIGHTEEN SEVENTY SIX THAT THERE WERE RAYS OF SOME SORT BEGINNING AT THE WIRE ATTACHED TO THE NEGATIVELY CHARGED CATHODE AND ENDING AT THE PART OF THE TUBE OPPOSITE THE CATHODE HE CALLED THEM CATHODE RAYS
e electric current interacting with molecules of air and heating them. Neither the light nor the sound is the electricity itself. In order to detect the electricity, the current ought to be forced across a gap containing nothing, not even air. In order to do that, wires would have to be sealed into a glass tube from which all (or almost all) the air was withdrawn. This was not easy to do and it was not until 1854 that Heinrich Geissler (1814-1879), a German glass-blower and inventor, accomplished this feat. The wires sealed into such a “Geissler tube” could be attached to the poles of an electric generator, and if enough voltage was built up, the current would leap across the vacuum. [Illustration: _A Geissler tube._ labelled: Current source] Such experiments were first performed by the German physicist Julius Plücker (1801-1868). In 1858 he noticed that when the current flowed across the vacuum there was a greenish glow about the wire that was attached to the cathode of the generator. ELECTRIC CURRENT INTERACTING WITH MOLECULES OF AIR AND HEATING THEM NEITHER THE LIGHT NOR THE SOUND IS THE ELECTRICITY ITSELF IN ORDER TO DETECT THE ELECTRICITY THE CURRENT OUGHT TO BE FORCED ACROSS A GAP CONTAINING NOTHING NOT EVEN AIR IN ORDER TO DO THAT WIRES WOULD HAVE TO BE SEALED INTO A GLASS TUBE FROM WHICH ALL OR ALMOST ALL THE AIR WAS WITHDRAWN THIS WAS NOT EASY TO DO AND IT WAS NOT UNTIL EIGHTEEN FIFTY FOUR THAT HEINRICH GEISLER EIGHTEEN FOURTEEN EIGHTEEN SEVENTY NINE A GERMAN GLASS BLOWER AND INVENTOR ACCOMPLISHED THIS FEAT THE WIRES SEALED INTO SUCH A GEESELER TUBE COULD BE ATTACHED TO THE POLES OF AN ELECTRIC GENERATOR AND IF ENOUGH VOLTAGE WAS BUILT UP THE CURRENT WOULD LEAP ACROSS THE VACUUM SUCH EXPERIMENTS WERE FIRST PERFORMED BY THE GERMAN PHYSICIST JULIUS PLUKER EIGHTEEN O ONE EIGHTEEN SIXTY EIGHT IN EIGHTEEN FIFTY EIGHT HE NOTICED THAT WHEN THE CURRENT FLOWED ACROSS THE VACUUM THERE WAS A GREENISH GLOW ABOUT THE WIRE THAT WAS ATTACHED TO THE CATHODE OF THE GENERATOR
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