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Updated: June 10, 2025
This is a small closed iron core transformer of peculiar design and having a primary and a secondary coil wound on it. This device is used to control the variations of the oscillating currents that are set up by the oscillator tube. It is made in three sizes and for the transmitter here described you want the smallest size, which has an output of 1/2 to 1-1/2 amperes. It costs about $10.00.
This is the same kind of a hot-wire ammeter already described in connection with the experimental set, but it reads to 5 amperes. The Grid and Blocking Condensers. Each of these is a fixed condenser of .002 mfd. capacitance and is rated to stand 3,000 volts. It is made like the aerial condenser but has only two terminals. It costs $2.00. The Key Circuit Apparatus.
Draw a square, A B C D divide B C into 746 parts, and C D into 1,000 parts, or, generally, let a division on C D be 0.746 of a division on B C, so that we can use the horizontal lines cutting A B as a horse power scale. A B, in the above diagram, gives 1,000 horse power, if the line B C represents 746 volts, and C D 1,000 amperes.
All of the apparatus for this C. W. telegraph transmitting set is the same as that described for the 100 and 200 mile sets but you will need: one or two 50 watt oscillator tubes with sockets; one key condenser that has a capacitance of 1 mfd., and a rated potential of 1,750 volts; one 0 to 500 milli-ammeter; one aerial ammeter reading to 5 amperes, and an A. C. power transformer for one or two 50 watt tubes.
Back in nineteen twenty, physicists had succeeded in making a current flow for four hours in a closed circuit. It was just a ring of lead, but the resistance was so low that the current kept on flowing. They even managed to get six hundred amperes through a piece of lead wire no bigger than a pencil lead. "I don't know why they didn't go on from there, but they didn't.
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.
This is the size of tube generally used by amateurs for long distance continuous wave telegraphy. A single tube will develop 2 to 3 amperes in your aerial. The filament takes a 10 volt current and a plate potential of 1,000 volts is needed. A tube socket to fit it costs $2.50 extra. The Aerial Ammeter. This should read to 5 amperes and the cost is $6.25. The Grid Leak Resistance.
One thing was unmistakable, and that was that the piles were of extraordinary strength; and the accumulators left those of Faure-Sellon-Volckmar very far behind in yielding currents whose amperes ran into figures up to then unknown. Thus there was obtained a power to drive the screws and communicate a suspending and propelling force in excess of all his requirements under any circumstances.
D'Arsonval obtained with an accumulator of 2 square meters of surface: Representing a total capacity of six ampere hours per kilo., and of a discharge of 5 amperes per kilo., or a total capacity of 81 ampere hours per square meter, and a useful capacity of 20 ampere hours per square meter.
The husband of the one dollar variety was more or less of a henpeck because he could not multiply his income by five and produce a concrete result. It was a very predominating mania with Mrs. Onedollar to shine in society with as great a number of amperes as her rival; and this ambition gave rise to one of the greatest domestic civil wars that Ashcroft has even seen. Mrs. Fivedollars had no envy.
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