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Updated: August 2, 2024
Suddenly the relay sounded again; the beam of radiance disappeared as quickly as it had come. In an instant, the blue violet glare of the relux plate had subsided to an angry red. The violent arcing had stopped, and the metal was cooling rapidly. A heavy purplish vapor in the crucible condensed on the walls into black, flakey crystals.
The plain spark-gap is more suitable for small spark-coil sets, and it is not so apt to break down the transformer and condenser of the larger sets as the rotary gap. The rotary gap on the other hand tends to prevent arcing and so the break is quicker and there is less dragging of the spark. The quenched gap is more efficient than either the plain or rotary gap and moreover it is noiseless.
A condenser is connected across the contact points of the vibrator since this gives a much higher voltage at the ends of the secondary coil than where the coil is used without it; this is because: the self-induction of the primary coil makes the pressure of the current rise and when the contact points close the circuit again it discharges through the primary coil, and when the break takes place the current flows into the condenser instead of arcing across the contact points.
The plain spark-gap is more suitable for small spark-coil sets, and it is not so apt to break down the transformer and condenser of the larger sets as the rotary gap. The rotary gap on the other hand tends to prevent arcing and so the break is quicker and there is less dragging of the spark. The quenched gap is more efficient than either the plain or rotary gap and moreover it is noiseless.
Either a fixed, a rotary, or a quenched spark gap can be used with this set, but the former is seldom used except with spark-coil sets, as it is very hard to keep the sparks from arcing when large currents are used.
The brass connections on it were black with age and with the arcing effects of lightning, which, to young Edison, seemed particularly partial to Louisville. "It would strike on the wires," he says, "with an explosion like a cannon-shot, making that office no place for an operator with heart-disease." Around the dingy walls were a dozen tables, the ends next to the wall.
And then there was the smell of burned insulation and a wire was arcing somewhere, while thick rubbery smoke arose. A fuse blew out with a thunderous report, and Tommy Reames leaped to the suddenly racing motor-generator. The motor died amid gasps and rumblings. And Tommy Reames looked anxiously at the Fifth-Dimension Tube. It was important, that Tube.
An intimation of some of the tremendous difficulties encountered in the construction of this machine has already been given in preceding pages, hence we shall not now enlarge on the subject, except to note in passing that the terribly destructive effects of the spark of self-induction and the arcing following it were first manifested in this powerful machine, but were finally overcome by Edison after a strenuous application of his powers to the solution of the problem.
Either a fixed, a rotary, or a quenched spark gap can be used with this set, but the former is seldom used except with spark-coil sets, as it is very hard to keep the sparks from arcing when large currents are used.
And when they finally did, Wade looked at the sky above them and shouted: "Say, look! What are all those streaks?" Arcing up from the surface of the dull red plain below them and going over the ship, were several dim streaks of light across the sky. One of them was brighter than the rest, a bright white streak.
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