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Updated: May 13, 2025
For this telephone transmitting set you need: one aerial ammeter; one tuning coil; one telephone modulator; one aerial series condenser; one 4 cell dry battery or a 6 volt storage battery; one microphone transmitter; one battery switch; one grid condenser; one grid leak; two 5 watt oscillator tubes with sockets; one blocking condenser; one oscillation choke coil; two filter condensers; one filter reactance coil; an alternating current power transformer, and two 20 watt rectifier vacuum tubes.
When people asked Democritus, 'How do you know? he answered, 'I laugh. And if I am asked, 'Why do you laugh? I shall answer, 'I know. However, I am not laughing. I am the rectifier of popular errors. I take upon myself the task of cleaning your intellects. They require it. Heaven permits people to deceive themselves, and to be deceived. It is useless to be absurdly modest.
Though the story is a fable, the moral is good to my present purpose, and is not at all above my subject; I mean that of a tradesman, who should be warned against over-trading, as earnestly, and with as much passion, as I would warn a dealer in gunpowder to be wary of fire, or a distiller or rectifier of spirits to moderate his furnace, lest the heads of his stills fly off, and he should be scalded to death.
As a matter of fact, it is not really a detector of electric waves, but it acts as: a rectifier of the oscillations that are set up in the receiving circuits, that is, it changes them into pulsating direct currents so that they will flow through and affect a telephone receiver, and it acts as a relay and the feeble received oscillating current controls the larger direct current from the B battery in very much the same way that a telegraph relay does.
When this is done the plates will be positively charged alternately with every reversal of the current in which case there will be no break in the continuity of the oscillations set up and therefore in the waves that are sent out. The Operation of Rectifier Vacuum Tubes. The vacuum tube rectifier is simply a two electrode vacuum tube. The Operation of Reactors and Condensers.
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