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Updated: May 4, 2025
"Yes, I know, but work without a holiday, without rest " "But think what it's going to be to us! All I've got to do now is to get my selenium cell simplified enough for commercial purposes! And another month will do it!" "But eight months ago you said that!" "There's nothing left to stick us now. Once I get this cell the way I want it, we'll start manufacturing, for all we're worth.
"Oh, they're easy, once you get used to them," said the young inventor, with a smile. "Perhaps it will be easier if I say that sometimes selenium is found in native sulphur. Selenium is usually obtained from the flue-dust or chamber deposits of some factory where sulphuric acid is made. They take this dust and treat it with acids until they get the pure selenium.
"I was speaking about selenium, a sort of metallic combination that is a peculiar conductor of electricity. The more light that shines on it the better conductor it is, and the less light, the poorer." "It must be queer stuff," said Ned. "It is," declared Tom.
These holes are filled with selenium, heated, and then cooled very slowly, so as to obtain the maximum sensitiveness. On each side of plate, B, are let in two brass rails, D and E, whereon the slide hereinafter described works. Rail, E, communicates with the line wire intended to conduct the various light and shade vibrations. Rail, D, is connected with the battery wire.
A beam of sun or electric light, concentrated by a lens L, is reflected by a thin mirror M, and after traversing another lens L, travels to the parabolic reflector R, in the focus of which there is a selenium resistance in circuit with a battery S and two telephones T T'. Now, when a person speaks into the tube at the back of the mirror M, the light is caused to vibrate with the sounds, and a wavering beam falls on the selenium, changing its resistance to the current.
He took out a large instrument composed of innumerable coils and a queer battery of selenium cells. It was the receiver of the new instrument by which a photograph could be sent over a telegraph wire. Down-stairs, in the telegraph room of the hotel, Arnold secured the services of one of the operators.
Then he came back and lifted his hat, hiding as much as possible the selenium cell, letting the light fall on it. "Only Elaine's life has saved you." With a last threat he dashed out. He hailed a cab, returning from some steamship wharves not far away. "Quick!" he ordered, giving the Dodge address on Fifth Avenue. Minute after minute the police and I waited. Was anything wrong? Where was Craig?
Just as the swaying and bulging door gave way, Clutching Hand gave the desk a pull. It opened up his getaway. He closed it with a sardonic smile in our direction, just before the door crashed in. We looked about. There was not a soul in the room, nothing but the selenium cell, the chairs, the desk. "Look!" I cried catching sight of the index finger, and going over to the desk.
It was still early evening, and Tom, when enticed out by Ned, had left his photo telephone apparatus in readiness to go on with his trials as soon as he should have come back. "Now for it, Ned!" exclaimed the young inventor, as he took off his coat. "First I'll sensitize a selenium plate, and then I'll wet it.
Selenium even emits notes under a vibratory beam of light, the pitch depending on the frequency. Changes in the intensity of the light focused by the reflector on the cell alter its electrical resistance and vary the current from the dry batteries. Hence the telephone receiver over there is affected. Bell used the photophone or radiophone over several hundred feet, Ruhmer over several miles.
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