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This kind of a set is called a full wave rectification transmitter. The waves radiated by this transmitter can be received by either a crystal detector or a plain vacuum-tube detector but the heterodyne receptor will give you better results than either of the foregoing types. The Operation of Wireless Telephone Transmitters with Direct Current Short Distance Transmitter.
Connel was busy too, noting buildings of identical design scattered around the canyon floor that were too small to be spaceship hangars or storage depots. He guessed that they were housings for vacuum-tube elevator shafts that led to underground caves.
Astro had expected a long march, but to his surprise, he was pushed along a well-worn jungle trail for only three hundred yards in from the tyrannosaurus's track. Finally they stopped before a huge teakwood tree. The leader pounded his rifle butt on the trunk three times. Mystified, Astro watched a small section of the trunk open to reveal a modern vacuum-tube elevator shaft.
There is even an old antique shop, known as Ye Quainte Olde Elecktronicks Shoppe, where you can buy such oddities as vacuum-tube FM radios and twenty-four-inch cathode-ray television sets. And, if you want them, transmitters to match, so you can watch the antiques work.
On the inside of this is spread a layer of tungstate of calcium. By placing the object to be observed, such as the hand, between the vacuum-tube and the fluorescent screen, the "shadow" is formed on the screen and can be observed at leisure. The apparatus has proved invaluable in surgery and has become an accepted part of the equipment of modern surgery.
This kind of a set is called a full wave rectification transmitter. The waves radiated by this transmitter can be received by either a crystal detector or a plain vacuum-tube detector but the heterodyne receptor will give you better results than either of the foregoing types. The Operation of Wireless Telephone Transmitters with Direct Current Short Distance Transmitter.
This glow is conceived to represent the Aurora, which may consequently be likened to a gigantic exhibition of vacuum-tube lights. Anybody who recalls his student days in the college laboratory and who has witnessed a display of Northern Lights will at once recognize the resemblance between them in colors, forms, and behavior.
Under another form, nevertheless, it has been detected as indubitably solar. A triplet of dark lines low down in the red, photographed from the sun by Higgs and McClean, was clearly identified by Runge and Paschen in 1896 with the fundamental group of an oxygen series, first seen by Piazzi Smyth in the spectrum of a vacuum-tube in 1883.
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