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Tried rhythmic traction of the tongue, artificial respiration, stimulants, chest and heart massage everything, but it was no use:" "Have you any idea what caused his death?" asked Craig as he hastily adjusted his apparatus to an electric light socket a rheostat, an induction-coil of peculiar shape, and an "interrupter." "Poison of some kind an alkaloid.
The groanings are here not there. You haven't been able to get in over there to attach anything, have you? What do you mean?" "No," he admitted, "but did you ever hear what you could do with a microphone, a rheostat, and a small transformer coil if you attached them properly to a direct-current electric lighting circuit? No? Well, an amateur with a little knowledge of electricity could do it.
A rheostat added to the accumulator makes it possible to graduate the light at one's leisure and cause it to pass through all the shades comprised between cherry-red and incandescence. Finally, the orifice through which the observer looks is of such dimensions that it gives passage to all the instruments necessary for treating complaints of the middle and internal ear.
Whatever you do be careful not to get the plate connections of the battery reversed. Now connect one of the posts of the rheostat to one terminal of the filament and the other terminal of the filament to the or negative terminal of the A or storage battery and the + or positive terminal of the A or storage battery to the other post of the rheostat.
Next connect the sliding contact of the primary coil with the other post of the variable condenser and from this lead a wire on over to one of the terminals of the filament of the vacuum tube; to the other terminal of the filament connect one of the posts of the rheostat and connect the other post to the or negative electrode of the A battery and then connect the + or positive electrode of it to the other terminal of the filament.
This done connect the other terminal of the filament to one post of the rheostat and the other post of this to the or negative side of the A battery. To the + electrode of the A battery connect the or zinc pole of the B battery and connect the + or carbon pole of the latter with one post of the fixed .001 microfarad condenser.
This put the powerful Arcot oscillator tubes into action, and the power was ready for application. Slowly he closed the rheostat and put the power into the coil. The little sliver of metal on the slide seemed to throb a bit, and its outline grew hazy; but at last, with full power on, the release was so slow as to be imperceptible. "Guess we need the magnet after all; I'll put it on this time."
This feature added immensely to the sensitiveness of the set. It consisted of a coil, variously known as the tickler, the intensity coil, and the regeneration coil. It involved three controls, the wave-length tuning, the regenerative coil, and the filament rheostat.
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.
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.
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