Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 6, 2025
It will be interesting to the modern electrician to note that when this pioneer station was started, and in fact for some little time afterward, there was not a single electrical instrument in the whole station not a voltmeter or an ammeter! Nor was there a central switchboard! Each dynamo had its own individual control switch.
The heavy coronium spring grew warm and began to glow dully, while the ammeter dropped slightly because of the increased resistance. The relux plate cooled slightly, and the voltmeter remained steady. "The coil you see is storing the energy that is flowing into it," Arcot explained.
Despite the fact that the voltmeter seemed to be shorted out by the relux plate, the needle pointed steadily at twenty-two. Arcot changed the current through the magnet, and the reading dropped to twenty. The rays had been on at very low power, the air only slightly ionized, but as Arcot turned a rheostat, the intensity increased, and the air in the path of the beam shone with an intense blue.
As he closed the switch, on no-load, the electrostatic voltmeter flopped over instantly, and steadied at just over 80,000 volts. "I hate to say 'I told you so," said Kendall. "But let's hook in a load. Try it on about 100 amps first." Devin began cutting in load. The resistors began heating up swiftly as more and more current flowed through them.
As I bent over, I could see the needle on its dial deflected just a bit. "My voltmeter," he said, reading it, "shows that there is a current of about 1.8 volts passing through this pipe all the time." "Electrolysis of water pipes!" I exclaimed, thinking of statements I had heard by engineers. "That's what they mean by stray or vagabond currents, isn't it?"
When a condenser is put on a dynamo, the condenser current leads relatively to the electromotive force, and therefore strengthens the field magnets and increases the pressure. In order to test this, the following experiment was made for the author by Mr. W.F. Bourne. A Gramme alternator was coupled to the low pressure coil of a transformer, and a hot wire voltmeter put across the primary circuit.
For this transmitter you require: one oscillation transformer; one hot-wire ammeter; one aerial series condenser; one grid leak resistance; one chopper; one key circuit choke coil; one 5 watt vacuum tube oscillator; one 6 volt storage battery; one battery rheostat; one battery voltmeter; one blocking condenser; one power circuit choke coil, and one motor-generator. The Oscillation Transformer.
By not so much as by a vibration of the voltmeter needle, did the apparatus betray any strain as the load mounted swiftly. 100 200 500 1000 amperes. Still, that needle held steady. Finally, with a drain of ten thousand amperes, all the equipment available could handle, the needle was steady as a rock, though the tremendous load of 800,000,000 watts was cut in and out.
The Filament Voltmeter. To get the best results it is necessary that the voltage of the current which heats the filament be kept at the same value all of the time. For this transmitter a direct current voltmeter reading from 0 to 15 volts is used. It is shown at F and costs $7.50. The Oscillation Choke Coil.
The aerial series condenser, the blocking condenser, the grid condenser, the telegraph key, the chopper, the choke coil in the key circuit, the filament voltmeter and the protective condenser in the power circuit are identical with those described for the 5 watt transmitting set. The 50 Watt Vacuum Tube Oscillator.
Word Of The Day
Others Looking