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Updated: June 3, 2025
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.
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.
Atterbury turned and groped his way through a doorway, and they passed first into what appeared to be a storage-battery room. Huge glass tanks filled with amber-coloured fluid, in which numerous parallel plates were supported, lined the walls from floor to ceiling. An ammeter on the wall caught Bennie's attention. "Weston Direct Reading A. C. Ammeter," he read on the dial. Alternate current!
The magnet leads were connected, and a coil, in the form of two toruses intersecting at right angles enclosed in a form-fitting relux case, had been connected to the heavy terminals of the relux plate. An ammeter and a heavy coil of coronium wire were connected in series with the coil, and a kilovoltmeter was connected across the terminals of the relux plate.
An ammeter inserted in the circuit will show at a glance what current is passing at any particular speed, and voltmeter readings are taken at the terminals of the machine, when the same is standing still as well as when the armature is running, because the E.M.F. indicated when the armature is at rest alone determines the commercial efficiency of the motor, whereas the E M.F. developed during motion varies with the speed until it nearly reaches the E.M.F. in the leads; at that point the theoretical efficiency will be highest.
Here and there the blazing of a group of lights, the ringing of a bell, the response of a volt or ammeter to test, hinted to the masters of the lightnings that their rebellious steeds again answered the bit. Within a half-hour the city's illuminations again reflected softly from the haze of the autumn sky; the clang of the merry trolley, the wail of the motor's siren again smote the air.
To do this you need only to use a voltmeter across the filament terminals instead of an ammeter in series with it; then regulate the voltage of the filament with a rheostat. The Operation of C. W. Telegraph Transmitters with Alternating Current With Two Oscillator Tubes. In other words these oscillations are sustained but as in the case of those of a single tube, their amplitude rises and falls.
It will be interesting to the modern electrician to note that when this pioneer station was started, and in fact for some little time afterward, there was not a single electrical instrument in the whole station not a voltmeter or an ammeter! Nor was there a central switchboard! Each dynamo had its own individual control switch.
When you tune the transmitter so that the ammeter shows the largest amount of current surging in the aerial wire system you can consider that the oscillation circuits are in tune. General view of Power Room. The Buzzer and Dry Cell.
There were two black discs, attached to a metal headpiece, discs about two and a half inches in diameter, with a circular hole in the centre of each, perhaps an inch across, showing inside what looked like a piece of iron or steel. Garrick carefully tested the batteries with a little ammeter which he carried in a case.
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