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If you are using a condenser having a capacitance of .007 microfarad, which is the largest capacity value that the Government will allow an amateur to use, then if you have a hot wire ammeter in your aerial and tune the inductance coil or coils until the ammeter shows the largest amount of energy flowing through it you will know that your transmitter is tuned and that the aerial is sending out waves whose length is 200 meters.
For this telephone transmitting set you need: one aerial ammeter; one tuning coil; one telephone modulator; one aerial series condenser; one 4 cell dry battery or a 6 volt storage battery; one microphone transmitter; one battery switch; one grid condenser; one grid leak; two 5 watt oscillator tubes with sockets; one blocking condenser; one oscillation choke coil; two filter condensers; one filter reactance coil; an alternating current power transformer, and two 20 watt rectifier vacuum tubes.
Surreptitiously he applied the slender cords of his pocket ammeter to the zinc and carbon of the dead batteries concerning whose freshness he and his assistant had argued. The delicate needle leaped forward, quivered like a snake's tongue, and hovered over a number. "Fifteen," read the repair man; and then, after a moment: "Hell!" The daily business, therefore, opened normally.
Now connect the end of the tuning coil that leads to the ammeter with one end of the .001 mfd. grid condenser and the other end of this with the grid of the vacuum tube. Connect the telegraph key, the buzzer and the dry cell in series and then shunt them around the grid condenser.
For this experimental continuous wave telegraph transmitter get the following pieces of apparatus: one single coil tuner with three clips; one .002 mfd. fixed condenser; three .001 mfd. condensers; one adjustable grid leak; one hot-wire ammeter; one buzzer; one dry cell; one telegraph key; one 100 volt plate vacuum tube amplifier; one 6 volt storage battery; one rheostat; one oscillation choke coil; one panel cut-out with a single-throw, double-pole switch, and a pair of fuse sockets on it.
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.
In order to protect the machines from the variable resistance within the furnace, a resistance box consisting of a coil of German silver wire placed in a large tank of water was introduced into the main circuit, and a Brush ammeter was also attached by means of a shunt circuit, to indicate the quantity of current that was being absorbed in the furnace.
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.
But so are you, my dear and pretty enough so that I'd try to make love to you, if I weren't afraid you'd slap me." "Mr. Bresnahan, do you talk that way to your wife's friends? And do you call them 'sister'?" "As a matter of fact, I do! And I make 'em like it. Score two!" But his chuckle was not so rotund, and he was very attentive to the ammeter.
Some one disappeared, to return with a box of new batteries. The head repair man connected a group of these with a small bell in the executive office. The instrument, however, failed to respond. "Try your ammeter," suggested Darrow, who had followed. The delicate needle of the instrument did not quiver. "Batteries dead!" said the repair man.
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