large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb_201
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb
English
12904
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. 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
, the break is not a large one, and the current is under a high driving force (which is called the “voltage”), then the current may leap across the break. If two ends of a wire, making up part of a broken circuit, are brought close to each other with nothing but air between, a spark may leap across the narrowing gap before they actually meet and, while it persists, the current will flow despite the break. The light of the spark, and the crackling sound it makes, are the results of the 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 In order to do that, wires would have to be sealed into a glass tube from which all (or almost all) the air was withdrawn.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. NOT A LARGE ONE AND THE CURRENT IS UNDER A HIGH DRIVING FORCE WHICH IS CALLED THE VOLTAGE THEN THE CURRENT MAY LEAP ACROSS THE BREAK IF TWO ENDS OF A WIRE MAKING UP PART OF A BROKEN CIRCUIT ARE BROUGHT CLOSE TO EACH OTHER WITH NOTHING BUT AIR BETWEEN A SPARK MAY LEAP ACROSS THE NARROWING GAP BEFORE THEY ACTUALLY MEET AND WHILE IT PERSISTS THE CURRENT WILL FLOW DESPITE THE BREAK THE LIGHT OF THE SPARK AND THE CRACKLING SOUND IT MAKES ARE THE RESULTS OF THE 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EVEN AIR IN ORDER TO DO THAT WIRES WOULD HAVE TO BE SEALED INTO A GLASS TUBE FROM WHICH ALL OR ALMOST ALL THE AIR WAS WITHDRAWN THIS WAS NOT EASY TO DO AND IT WAS NOT UNTIL EIGHTEEN FIFTY FOUR THAT HEINRICH GEISLER EIGHTEEN FOURTEEN EIGHTEEN SEVENTY NINE A GERMAN GLASS BLOWER AND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
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