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Updated: May 25, 2025
If they put a detector on us, I've got a force set to make a noise like a New York City fire siren. If pressed, I'd reluctantly admit that in my opinion we're carrying caution to a point ten thousand degrees below the absolute zero of sanity. I'll bet my shirt that we don't hear a yip out of them before we touch 'em off. Furthermore...."
She must be signalling." A thrill goes through the battleship. In a minute the big steel fighter may be lying on her side, stricken; or there may be the opportunity for a fair fight. The captain sends an officer below to the detector and changes the course of the ship. Every one awaits developments, tensely. The wireless operator enters the chart-house. I can't raise her.
He hurries to the bridge with the solution of the incident. The wireless had become disconnected and its signals had come in contact with the detector. So there was no submarine. Everything serene. The battleship settles down to her night routine.
This latter relay action will be explained when we come to its operation as an amplifier. We have just learned that when the stream of electrons flow from the hot wire to the cold positive plate in the tube they form a conducting path through which the battery current can flow. This is the reason the vacuum tube amplifies as well as detects. How the Three Electrode Tube Acts as a Detector.
My detector had then handed over my purse, containing forty ducats, to the police, and the money had of course been confiscated. The empress had to choose between believing Schrotembach and dismissing him; and she was not inclined to do the latter, as it would be a difficult matter to find him a successor in his difficult and odious task of keeping Vienna clear of human vermin.
A storage battery is used to heat the filament of the tube, just as it is with a detector tube, and it can be of any make or capacity as long as it will develop 6 volts. The cheapest 6 volt storage battery on the market has a 20 to 40 ampere-hour capacity and sells for $13.00. The Battery Rheostat. As with the receptors a rheostat is needed to regulate the current that heats the filament.
In this way then are the faint incoming signals, speech and music which are received by the amplifying receiving set reproduced and magnified enormously. The Telemegafone is shown complete at B. From the foregoing chapters you have seen that the vacuum tube can be used either as a detector or an amplifier or as a generator of electric oscillations, as in the case of the heterodyne receiving set.
"Now," he went on, "this property of selenium is used for producing or rather allowing to be transmitted an electric current which is interrupted by a special clockwork interrupter, and so is made audible in this wireless telephone receiver which I have here connected with this second box. The eye is replaced by the ear as the detector of light that is all."
In the Marconi system of the present time there are many forms of coherers, also the magnetic detector and other variations of the original apparatus. Other systems more or less prominent are the Lodge-Muirhead of England, Braun-Siemens of Germany and those of DeForest and Fessenden of America. The electrolytic detector with the paste between the tin blocks belongs to the system of DeForest.
Seaton fastened a detector ray upon stop twenty-nine of the tracer-ray panel and followed its beam of force out to the torpedo hastening upon its way toward the next doomed cruiser. Flashing ahead in its line as he had done before, he located the vessel and clamped the electrodes of force upon the prodigious driving bar.
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