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In appearance it was not unlike a large radio set, but it was infinitely more complex. It possessed numerous tubes, kino-lamps, and photo-electric cells, as well as many coils of peculiar design there were dozens of dials and knobs, and a multiple set of head-harnesses. "How can a thing like that possibly work as it does?" asked Crane.
The rays from this flame were then directed by mirrors to a distant receiving station and there concentrated on a photo-electric selenium cell, which has the strange property of varying its resistance according to the illumination. Thus a telephone receiver arranged in series with it was made to reproduce the sounds.
McGuire was facing the east. The sun was just right to reflect a powerful beam of sunlight into the door to the photo-electric cell with a piece of mirror. If you will look, Judge, you will find that door open. "The act before that was the kidnapping of Matthews' nephew. Brown, inherently a decent chap, balked at that but he was too involved by then.
I erected a lever behind it operated by a trigger-like arrangement. I installed a photo-electric cell with wires running to the trigger. I was going to shore up this side of the decline running from the rock, so that when the trigger released it, it would be deflected and roll into the lake. "But at that point, this deplorable affair with our group happened.
I could have been invisible to Thett's ships as we followed them here, and for the greater part of the way I was, for I was sufficiently out of their time-rate, so that they were visible only by the short ultra-violet, which would have put in their infra-red, and, no photo-electric cell will work on quanta of such low energy.
Professor Brierly's eyes gleamed with interest as his eyes fell on a series of tubes, some of which resembled radio tubes in their sockets. "Ah," he murmured. "Photo-electric tubes. It should be fairly easy for you to keep apace with that for the reason that this particular branch of science is still in its infancy and we are all groping in the dark.
At last the work was done and the ship flashed on its way under the control of the instruments that would guide it across all the millions of miles of space and land it on Venus with unerring certainty. The photo-electric telescopic eye watched the planet constantly, keeping the ship surely and accurately on the course that would get them to the distant planet in the shortest possible time.
If the rock came down it would hit the roof of the porch and kill whoever happened to be there. You say you have installed the photo-electric cell? What is to prevent ". "Oh, I have guarded against that, Professor. I placed the tube up there," he pointed to what looked like a bird's nest near one of the gables.
Not only does it compete with the human will; it also makes possible automatically intelligent operations quite beyond anything man can do on his own. There are innumerable examples of this in modern electrical technology; we need mention here only the photo-electric cell and the many devices into which it enters.
The wonders of the motion picture, of radio, of television, of radar, of the photo-electric cell-the all-seeing "electric eye," of atomic energies, are all based on the electromagnetic phenomenon of light. The motion picture art can portray any miracle. From the impressive visual standpoint, no marvel is barred to trick photography.
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