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Phobos was setting for the first time that night when Dark reached the great hulk of Ultra Vires, manipulated one of the airlocks and entered its dark corridors. There was no light, and a test of the light switch proved that the electrical system was no longer operating. But Dark knew every inch of this place from early childhood.
Edison's lighting work furnished an excellent basis in fact, the only one for the development of the alternating current now so generally employed in central-station work in America; and in the McGraw Electrical Directory of April, 1909, no fewer than 4164 stations out of 5780 reported its use.
I used to be a man who went about the country with an electric machine, giving people electrical treatments for rheumatism and other pains. I made some money, but my wife died and her sickness and burial took all I had. Then my electrical machine broke and I could not buy another. "However, I did manage to get a little one, run with dry batteries, and I began going about the country making cures.
Whenever the point of the stylus passes over one of the lighter spots on the photographic print it sends on a longer electrical vibration, over the darker spots a shorter vibration.
Another participant in the controversy on Edison's generator was a scientific gentleman, who in a long article published in the Scientific American, in November, 1879, gravely undertook to instruct Edison in the A B C of electrical principles, and then proceeded to demonstrate mathematically the IMPOSSIBILITY of doing WHAT EDISON HAD ACTUALLY DONE. This critic concludes with a gentle rebuke to the inventor for ill-timed jesting, and a suggestion to furnish AUTHENTIC information!
He was now screwing up all that he had previously unscrewed. "Think she'll go now?" I pleaded. He screwed up several dozen things, and whistled a while. Then the oracle gave voice: "'Fraid the batteries won't do; they're awful weak!" With a bitter heart, I turned on my heel and went forth once more. Electrical supplies were not on sale at any of the stores.
While the term "wireless telegraphy," as now applied to the modern method of electrical communication between distant points without intervening conductors, is self-explanatory, it was also applicable, strictly speaking, to the previous art of telegraphing to and from moving trains, and between points not greatly remote from each other, and not connected together with wires.
Stated very briefly, Edison's principal contribution to the commercial development of the automatic was based on the observation that in a line of considerable length electrical impulses become enormously extended, or sluggish, due to a phenomenon known as self-induction, which with ordinary Morse work is in a measure corrected by condensers.
"Only the variations in the waves can be detected, or transformed into sound at the receiving end of a radio telephone system. Therefore an immense amount of electrical energy has to be manufactured in order that the voice vibrations may register their variations as powerfully as possible."
It happened that there were on board some scientists who had been interested in electrical development, and the talk one evening turned on electricity.
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