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Updated: May 7, 2025
Amplifying tubes are made to stand a plate potential of 100 volts and this is the kind you must use.
Telephone Induction Coil. Microphone Transformer. Magnetic Modulator. The Telephone Induction Coil. This is a little induction coil that transforms the 6-volt battery current after it has flowed through and been modulated by the microphone transmitter into alternating currents that have a potential of 1,000 volts of more.
There are various methods of producing the alternating current for transmission purposes. In some cases the generators are themselves wound for high potential; in others they are wound for 80 volts, and step-up transformers are used, carrying the current up to whatever pressure is desired, from 1,000 to 10,000 volts.
For instance with a wireless telephone transmitter where an amplifier tube is used to set up the oscillations and which is made for a plate potential of 100 volts, distances up to 10 or 15 miles can be covered. Where two 5 watt tubes connected in parallel are used wireless telephone messages can be transmitted to distances of 40 or 50 miles.
This apparatus has always given me on discharging 40 amperes at the E.M.F. of 1.85 volts during 60 or 65 minutes. The charge is effected in two hours up to 20 amperes, without any appreciable loss of electricity. "The points to be aimed at in an accumulator are longevity and energy, or, rather, rapid yield per kilo.
Their harm is rather that they distract attention from the true working method, and secure a fair result at the expense of the perfect one. What that perfect method is we shall now go on to ask. A formula, a receipt for Sanctification can one seriously speak of this mighty change as if the process were as definite as for the production of so many volts of electricity?
Of course, this system was intended to be applied in every part of a district to be supplied with current, separate sets of feeders running out from the station to the various centres. The distribution mains were to be of sufficiently large size that between their most extreme points the loss would not be more than 3 volts.
"There was a flash of blue flame and a shriek of pain as 11,000 volts of electricity shot through the wire. In a moment Pietro's clothing was on fire and his hair and eyebrows were burned off. He tried to drop the wire, as it hissed and sputtered at white heat, but it wouldn't let go. He tried to pull it away, but it stuck to the rail as if it were soldered there.
The power of the brushes, the abundance of the sparks, when the conditions are patiently adjusted, is often amazing. With even a very small coil, if it be so well insulated as to stand a difference of potential of several thousand volts per turn, the sparks may be so abundant that the whole coil may appear a complete mass of fire.
For instance with a wireless telephone transmitter where an amplifier tube is used to set up the oscillations and which is made for a plate potential of 100 volts, distances up to 10 or 15 miles can be covered. Where two 5 watt tubes connected in parallel are used wireless telephone messages can be transmitted to distances of 40 or 50 miles.
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