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Updated: May 4, 2025
I must try a different solution of selenium on the metal plate. Perhaps I may have to try using a sensitized plate, and develop it later, though I do want to get the machine down so you can see a perfect image without the need of developing. And I will, too!" cried Tom. "I'll get some new selenium." Eradicate, who came into the shop just then, heard the end of Tom's remarks.
Two French officers, working independently, have hit upon the same idea of receiving the indications transmitted by the vibration of the luminous fascicle directly upon their travel. The method consists in the use of that peculiar property of selenium of becoming a good conductor under the action of a luminous ray, while in darkness it totally prevents the passage of the electric current.
I was about to ask Kennedy point- blank what he thought of them, when suddenly the little bell before us began to buzz feebly under the influence of a current. I gave a start. The faithful little selenium cell burglar alarm had done the trick. I knew that selenium was a good conductor of electricity in the light, poor in the dark.
I wrote AT my story, but succeeded only in making it more unintelligible. I was in no fit condition for it. It was late in the afternoon. I had made up my mind to use force, if necessary, to separate Kennedy from his study of selenium.
"The parabolic reflector over there catches these light vibrations and focuses them on the cell of selenium which you perhaps noticed in the centre of the reflector. You remember doubtless that the element selenium varies its electrical resistance under light? Thus there are reproduced similar variations in the cell to those vibrations here in this transmitter.
Let us suppose that the slide of transmitter is on contact No. 10 for instance; the selenium current starting from No. 10 reaches contact 10 of rectangular transmitter, half the slide bearing on this point, as also on the parallel rail, communicates the current to said rail, thence to line, from the line to axis of cogged wheel, from axis to contact 10 of circular fixed disk, and thence to contact 10 of receiver.
Just then there came a knock at the door. I opened it. "Hello, Chase," greeted Kennedy. "Well, I've found the new headquarters all right, over on the west side." Kennedy picked up the selenium cell and a long coil of fine wire which he placed in a bag. Then he took another bag already packed and, shifting them between us, we hurried down town.
A brass plate, A, whereon the rays of light impinge inside a camera, in their various forms and colors, from the external objects placed before the lens, the said plate being coated with selenium on the side intended to face the dark portion of the camera This brass plate has its entire surface perforated with small holes as near to one another as practicable.
It will depend upon the subsequent course of the disease, whether or not a second, or it may be even a third, application of radium will be required. Where neither radium nor X-rays is available or applicable, recourse may be had to the injection of Coley's fluid, a preparation containing the mixed toxins of the streptococcus of erysipelas and the bacillus prodigiosus; or of selenium.
At each selenium contact of the rectangular disk there is a corresponding contact to the battery and electro-magnet.
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