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If it does fail and remember I'm not counting on its working of course I'll tackle the transmission and receptor units before we start out to drift it." "You say it easy, Steve, but how can you build all those things, with nothing to work with?" "It's going to be a real job I'm not try to kid you into thinking it'll be either easy or quick. Here's the way everything will go.
As I said before, I'm with you from now on, in whatever you think best to do. I know that you think it best to go out there. Therefore, so do I." "Well," he said, finally, "I'd better get busy, then there's a lot to do before we can start. The radio doesn't come next, after all the transmitter and receptor units come ahead of it.
In simple electric resonance an oscillating current of a given frequency flowing in a circuit having the proper inductance and capacitance may increase the voltage until it is several times greater than its normal value. Tuning the receptor circuits to the transmitter circuits are examples of sympathetic electric resonance.
"About the burglary business," he said confidently. "What did I do in the power station before I smashed the receptor?" The justice looked at Nedda's father's attorney. "Why," said that gentleman amiably, "speaking for the Power Board as complainant, before you smashed the standard receptor you connected a device of your own design across the power-leads.
"About as doubtful as the radio I think that I could build a pair of matched-frequency auto-dirigible transmitter and receptor units, such as are necessary for space-ships fed by stationary power-plants, but after I got them built, they'd take us less than half way there. Then we'd have only what power we can carry, and I hate even to think of what probably would happen to us.
Of course, if you want to talk back you must have a wireless transmitter, either telegraphic or telephonic, and this is a much more expensive part of the apparatus than the receptor, both in its initial cost and in its operation.
The visible box now becomes a stimulus capable of releasing either the bodily habits or the word-habit, i.e. development has brought about two things: a series of functional connections among arcs which run from visual receptor to muscles of throat, and a series of already earlier connected arcs which run from the same receptor to the bodily muscles.... The object meets the child's vision.
In music a beat means a regularly recurrent swelling caused by the reinforcement of a sound and this is set up by the interference of sound waves which have slightly different periods of vibration as, for instance, when two tones take place that are not quite in tune with each other. This, then, is the principle of the heterodyne, or beat, receptor.
To receive wireless telegraph signals, however, from a transmitter that uses an arc or a vacuum tube oscillator and which sends out continuous waves, either the transmitter or the receptor must be so constructed that the continuous waves will be broken up into groups of audio frequency and this is done in several different ways. The heterodyne method will be described in this chapter.
Of course, if you want to talk back you must have a wireless transmitter, either telegraphic or telephonic, and this is a much more expensive part of the apparatus than the receptor, both in its initial cost and in its operation.
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