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Updated: May 4, 2025
Variations of light can thus be transmuted into variations of sound. That pushed-in end of the box which we hid over in Warrington's had, as you might have noticed, a selenium plate on the inside partition, facing the open end of the box." "I understand," I agreed, vaguely.
It was not a very difficult matter to conceal it, so crowded was the room, or to lead the ends out through a window at the opposite side from that where the window had been broken open. Up-stairs in the art-gallery he next installed several boxes such as those which I had seen him experimenting with during his tests of selenium on the afternoon when Mr. Spencer had first called on us.
This apparatus requires two batteries, as, in fact, do all autographic telegraphs one for sending the current through the selenium, and one for working the receiver, etc. D. Brass rail, grooved and connected with the line wire working the receiver. F. Contacts connected underneath with a wire permanently connected with battery. C. Contacts connected to insulated wires from selenium.
Chlorine, iodine, bromine, and fluorine thus formed a very distinct group; sulphur and selenium another; boron and silicon another; potassium, sodium, and lithium another; and so on. In some cases, the atomic weights of such allied bodies were nearly the same, or could be arranged in series, with like differences between the several terms.
The action of the photophone is based on the peculiar fact observed in 1873 by Mr J E Mayhew, that the electrical resistance of crystalline selenium diminishes when a ray of light falls upon it.
Tom was filled with enthusiasm, and he was sure it was going to be successful this time. Ned watched him prepare the selenium plates plates that were so sensitive to illumination that, in the dark, the metal would hardly transmit a current of electricity, but in the light would do so readily, its conductivity depending on the amount of light it received.
It is on this principle, too, that the small concentrated residues of great operations in the arts are almost sure to be the lurking-places of new chemical ingredients: witness iodine, brome, selenium, and the new metals accompanying platina in the experiments of Wollaston and Tennant. It was a happy thought of Glauber to examine what every body else threw away.”
Paramagnetic Diamagnetic Iron Bismuth Nickel Phosphorus Cobalt Antimony Aluminium Zinc Manganese Mercury Chromium Lead Cerium Silver Titanium Copper Platinum Water Many ores and Alcohol salts of the Tellurium above metals Selenium Oxygen Sulphur Thallium Hydrogen Air We have theories of magnetism that reduce it to a phenomenon of electricity, though we are ignorant of the real nature of both.
They seem to come back to their old haunts. Nearly any police story proves this. And it's that on which I am counting to capture this criminal. So I'm going to fit up as many telephones with my photo and phonograph outfit, as I can in the time we have. You'll have to help me. Luckily I've got plenty of selenium plates for the sending end. I'll only need one at the receiving end.
Photograph follows. "Very well," nodded Arnold with satisfaction. "I think I know what is going on here now. Let us wait for the photograph." He went over to the new selenium telaphotograph and began adjusting it.
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