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Updated: June 4, 2025
What mathematical equivalent could he suggest as the value of a Branly coherer? Frozen air, or the electric furnace, had some scale of measurement, no doubt, if somebody could invent a thermometer adequate to the purpose; but X-rays had played no part whatever in man's consciousness, and the atom itself had figured only as a fiction of thought.
The officer hadn't had time to get the message ready for the bridge, when the instrument again began to rattle madly: "Take care of Kxj31mpTwB8d 951SR7 J," warned the strip in its mute language; then nothing further; complete silence reigned. "What does this mean?" said the officer, "this can't be all." He knocked on the coherer, then put in a new one: not a sign.
I had some knowledge of Morse telegraphy, and of the manipulation of tape-machines, telegraphic typing-machines, and the ordinary wireless transmitter and coherer, as of most little things of that sort which came within the outskirts of the interest of a man of science; I had collaborated with Professor Stanistreet in the production of a text-book called 'Applications of Science to the Arts, which had brought us some notoriety; and, on the whole, the minutiae of modern things were still pretty fresh in my memory.
The waves spread in all directions from the sending station and become feebler and feebler as the distance increases. To make wireless telegraphy effective over any considerable distance a highly efficient and extremely sensitive receiving device is necessary. Some special means of detecting the feeble currents was necessary. The coherer was the solution. As early as 1870 a Mr.
Marconi further discovered that the most effective arrangement was to run a wire from one terminal of the coherer into the ground, and from the other to an elevated metal plate or wire. The waves coming through the ether were received by the elevated wire and were conducted down to the coherer.
"Perhaps it was the chloric-ether." "Oh, he's all right." The spade-bearded man glanced at him pityingly. "Consumptives go off in those sort of doses very often. It's exhaustion... I don't wonder. I dare say the liquor will do him good. It's grand stuff," he finished his share appreciatively. "Well, as I was saying before he interrupted about this little coherer.
It's just It what we call Electricity, but the magic the manifestations the Hertzian waves are all revealed by this. The coherer, we call it." He picked up a glass tube not much thicker than a thermometer, in which, almost touching, were two tiny silver plugs, and between them an infinitesimal pinch of metallic dust. "That's all," he said, proudly, as though himself responsible for the wonder.
It suggests something to me, but it will need a good deal of work to verify it, and then it may not be of any significance. Is that the way the Z99 has behaved always lately?" "Yes, but I know that she hasn't broken down of herself," Captain Shirley asserted. "It never did before, not since I perfected that new coherer.
He arranged metal filings in a small glass tube six inches long and arranged a tapper to disarrange the filings after they had been brought together under the influence of the spark. With the Branly coherer as the basis Marconi sought to make improvements which would result in the detector he was seeking. For his powder he used nickel, mixed with a small proportion of fine silver filings.
Before this historical chasm, a mind like that of Adams felt itself helpless; he turned from the Virgin to the Dynamo as though he were a Branly coherer.
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