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Updated: June 22, 2025
A storage battery is used to heat the filament of the tube, just as it is with a detector tube, and it can be of any make or capacity as long as it will develop 6 volts. The cheapest 6 volt storage battery on the market has a 20 to 40 ampere-hour capacity and sells for $13.00. The Battery Rheostat. As with the receptors a rheostat is needed to regulate the current that heats the filament.
A Simple Vacuum Tube Receiving Set. For this set you should use: a loose coupled tuning coil, a variable condenser, a vacuum tube detector, an A or storage battery giving 6 volts, a B or dry cell battery giving 22-1/2 volts, a rheostat for varying the storage battery current, and a pair of 2,000-ohm head telephone receivers. The Vacuum Tube Detector. With Two Electrodes.
Run this wire on over and connect it with the first post of the second rheostat, the second post of which is connected with one terminal of the filament of the first amplifying tube; then connect the first post of the rheostat with one end of the secondary coil of the first audio frequency transformer, and the other end of this coil with the grid of the first amplifier tube.
Opposite the two slits, a and a', there are two powerful converging lenses, l and l', whose foci coincide with two sorts of selenium plate rheostat, z and z'. The result of this arrangement is that as soon as one of the slits, as a consequence of the displacement of the helix, r, allows a luminous fascicle to escape, this latter falls upon the corresponding lens, which concentrates it and sends it to the selenium plates just mentioned.
His visit was merely for the purpose of gathering some apparatus, which included a Crookes tube, carefully packed, a rheostat, and some other paraphernalia which we divided. A few moments later we were on our way again to the Blakeley mansion. No change had taken place in the condition of the patient, and Mrs. Blakeley met us anxiously.
He took him into an inner office and showed his batteries, and explained that the peculiarity of his process consisted, not in any new general laws and facts of physiology which he had discovered, but entirely in peculiarities in his manner of applying his galvanic current, talking much about apodes, cathodes, catelectrotonus and anelectrotonus, resistance and rheostat, reactions, fluctuations, and other terms of galvano-therapeutics.
He kept on turning the rheostat until the incoming voices seemed about the same pitch as his own voice. The excitement of the natives had grown to tremendous proportions, and his own equalled theirs. Their little mouths were working faster, and an expression almost like laughter came onto their peculiar little faces, as they heard his voice and knew he could now hear theirs.
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.
The smallest size coils cost about $1.50 apiece and the mounting costs about $6 or $7 each. The A Battery Potentiometer. This device is simply a resistance like the rheostat described in connection with the preceding vacuum tube receiving sets but it is wound to 200 or 300 ohms resistance as against 1-1/2 to 6 ohms of the rheostat. It is, however, used as well as the rheostat.
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