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The sky-car was rapidly sinking nearer and nearer the planet; already Smith had stopped the current with which he had attracted the cube toward the little world's northern hemisphere, and was now using negative voltage. This, in order to act as a brake, and prevent them from falling to destruction.
Not once had that peculiar smile faded from Jack's lips or the glint in his eyes diverted from its probe of Leddy's eyes. His voice went well with the smile and with an undercurrent of high voltage which seemed the audible corollary of the glint. Every man knew that, despite his gay adornment, he was not bluffing. He had made his proposition in deadly earnest and was ready to carry it out.
He immediately began explaining the apparatus of the wireless room how messages were sent and received; the power of the batteries and their auxiliaries; the switch-board regulating voltage; the automatic recording apparatus in fact, every detail connected with the intricate mechanism of an up-to-date wireless.
This current sets up an alternating magnetic field in the core of the transformer and as these magnetic lines of force expand and contract they set up alternating currents of the same frequency but of much higher voltage at the terminals of the secondary coil according to the ratio of the primary and secondary turns of wire as explained under the sub-caption of Ratio of Transformation.
With the utilization of heavy currents at low voltage it became necessary, of course, to devise apparatus which should be able to pick up with absolute certainty one thousand amperes of current at this pressure through two inches of mud, if necessary.
The reduction of the voltage was accomplished as follows: The 100,000-volt alternating current was received through an oil switch and was conveyed to a high-tension current distributor made up of three lines of copper tubing, thus forming the source of power for this station.
All these must be tested out by the aid of a storage battery. When the defective parts had been discarded, it was necessary to piece together, out of the remaining parts and the extra equipment, an entirely new set. "Have to use a two-stage amplifier," shouted Curlie, making himself heard above the storm. "Lower voltage on the grid, too," Joe shouted back.
Where the voltage is not dangerous to human life, almost any service connection can be made without interruption of service.
When oscillations are set up in it the grid is alternately charged to the positive and negative signs. These reversals of voltage set up stronger and ever stronger oscillations in the plate circuit as before explained. Not only do the oscillations surge in the closed circuits but they run to and fro on the aerial wire when their energy is radiated in the form of electric waves.
To increase the voltage or pressure materially, while permitting some saving in the cost of conductors, would enormously increase the difficulties of making a sufficiently high resistance conductor to secure light by incandescence.
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