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Updated: September 7, 2025
It is easy, for instance, to construct a transformer capable of giving, when operated from an ordinary alternate current machine of low tension, say 50,000 volts, which might be required to light a highly exhausted phosphorescent tube, so that, in spite of the high potential, it is perfectly safe, the shock from it producing no inconvenience.
And now, while I stood to get my wind, he explained how it was done, showing me sudden volts and turns and shifts which he termed foot-work.
In other cases, where a small amount of alternating current is required on the transmission line, it has even been found economical to take direct current from a large unit, change it by means of a rotary transformer into alternating current, step up from 80 to, say, 2,000 volts, go to the distant point, and step down again to 80 volts alternating, and then convert again by means of a rotary transformer into low-potential direct current.
A small alternator of 200 watts and 100 volts is coupled direct to the aeroplane motor, a new clutch coupler being employed for this purpose. By means of a small transformer the voltage is raised to 30,000 volts, at which the condenser is charged. In this instance the musical spark method is employed.
The Vacuum Tube Oscillator. As explained before you can use any amplifying tube that is made for a plate potential of 100 volts. The current required for heating the filament is about 1 ampere at 6 volts. A porcelain socket should be used for this tube as it is the best insulating material for the purpose. An amplifier tube of this type is shown at H and costs $6.50. The Storage Battery.
Yields No Electrical Power. Other rivers throughout California and the West are yielding millions of volts annually of electrical energy, for the lighting and heating of cities, the turning of mill-wheels, and the running of electric cars; but the Colorado, though possessed of a potential energy greater than any ten or twenty of these rivers combined, so far has refused to yield up a single volt.
The usual voltage for these motors is 3,000 volts, but in the polyphase plant designed for the Cascade Tunnel 6,000 volts are to be used. They possess many advantages, especially their ability to run at overload, and consequently a locomotive with polyphase motor will run up grade without serious loss of speed.
And then we stood on a high platform surrounded by handles, switches, signals apparatus enough to put all New York into darkness, or to annihilate it in an instant by the unloosing of terrible cohorts of volts! and faced an enormous white hall, sparsely peopled by a few colossal machines that seemed to be revolving and oscillating about their business with the fatalism of conquered and resigned leviathans.
Where more energy is needed it is better practice to use a transformer and this can be worked on an alternating current of 110 volts, or if only a 110 volt direct current is available then an electrolytic interrupter must be used to make and break the current.
When the electrical pressure was normal, neither lamp was lighted; but if the electromotive force rose above a predetermined amount by one or two volts, the red lamp lighted up, and the attendant at the hand-wheel of the field regulator inserted resistance in the field circuit, whereas, if the blue lamp lighted, resistance was cut out until the pressure was raised to normal.
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