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Updated: May 4, 2025
You struck ME, you mean!" replied Ned, rubbing his shoulder, where the young inventor had imparted a resounding blow of joy. "What of it?" exclaimed Tom. "My apparatus works! I can send a picture by telephone! It's great, Ned!" "But I don't exactly understand how it happened," said Ned, in some bewilderment, as he gazed at the selenium plate.
If you compare my suggested formulation to another one, keep in mind that variations of 25 percent one way or another won't make a significant difference, and adding other beneficial substances to my recommendations probably is only helpful. However, I would not want to eliminate anything in the list below, it is the minimum: Beta-Carotene 25,000 iu Selenium 100 mcg
Let us suppose, in fact, that the current which is traversing the spirals of the helix, r, has a direction such that the helix in its movement approaches the pole, S; then the prolongation, v, will uncover the slit, a, which, along with a', had up to this moment been closed, and a luminous fascicle escaping through a will strike the lens, l', and from thence converge upon the selenium plates, z'. This is all the duty that the line current has to perform.
It was known that crystalline selenium is a substance peculiarly sensitive to light, for when a ray strikes it an electric current passes far more easily through it than if it were kept in the dark.
While I was delegated to take Miss Wallace home, Kennedy made arrangements with a small shopkeeper on the ground floor of a building that backed up on the court for the use of his back room that night, and had already set up a bell actuated by a system of relays which the weak current from the selenium cells could operate.
If, then, in the line of travel of the luminous fascicle emitted by the optical apparatus, or in a portion of such fascicle, we interpose a fragment of selenium connected with the two poles of a local pile, it is easy to see that the current from the latter will be opened or closed according as the luminous ray from the apparatus will or will not strike the selenium, and that the length of time during which the current passes will depend upon the length of the luminous attacks.
Just then a tremor grew into a tinkle, then came the strong burr of the bell. Kennedy needed us. With a shout of encouragement to the men I dashed out and over to the old house. Meanwhile Clutching Hand himself had approached the table to recover his weapon and had noticed the queer little selenium cell. He picked it up and for the first time saw the wire leading out. "The deuce!" he cried.
Opposite the two slits, a and a', there are two powerful converging lenses, l and l', whose foci coincide with two sorts of selenium plate rheostat, z and z'. The result of this arrangement is that as soon as one of the slits, as a consequence of the displacement of the helix, r, allows a luminous fascicle to escape, this latter falls upon the corresponding lens, which concentrates it and sends it to the selenium plates just mentioned.
"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.
That parabolic mirror gathers in the scattered rays, focusses them on the selenium cell which you saw in the middle of the reflector, and that causes the cell to vary the amount of electric current passing through it from a battery of storage cells. It is connected with a very good telephone receiver.
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