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Updated: June 4, 2025
The vibrations in the ether circled wider and wider, as the circular waves spread from the spot where a stone is dropped into a pool, but with the speed of light, until they reached a corresponding tin box on top of a like pole on the other side of the garden; this box, and the wire connected with it, caught the waves, carried them down to the coherer, and, joining the current from the local battery, a dot or dash was recorded; immediately after, the tapper separated the metal particles in the coherer and it was ready for the next series of waves.
The coherer until recently has been spasmodic, until we had Hammond's mercury steel- disc coherer and now my own. Why," he cried, "we are just on the threshold, now, of this great science which Tesla has named telautomatics the electric arm that we can stretch out through space to do our work and fight our battles."
A few metallic atoms from the coherer on the floor of the smoking-room had caught Merton's eye before breakfast on Sunday morning. Now it was Friday morning! And still no means of detecting and capturing the kidnappers had been discovered. Out of the captive nothing could be extracted. The room had been cleared, save for Mr. Macrae, Logan, and Bude, and the man had been interrogated.
When once it is clearly seen that by delicate electrical instruments, such as the telephone, the microphone and the coherer as used in wireless telegraphy, the line of least resistance on any given area of the earth's surface or any given piece of its crust may be determined, the bearing of that fact in showing the best lines of moisture and therefore the likeliest lines for mineral lodes will soon be recognised in a very practical manner.
If only it were possible to catch in some great "receiver" or "coherer," or some similar instrument, all the things that were said in London in the course of twenty-four hours about the United States by people who had been there, and all the things that were said in New York in the same period about England by people of equal experience, and set them down side by side, it would make entertaining reading.
"This is Sergeant Medlow. I've just received from Magdalen Bay the message now on the way to the bridge: 'Take care of then the connection was cut off.... All right, sir." Two minutes later an excited lieutenant rushed in crying: "What's the matter with the apparatus?" "It won't work, sir; it stopped in the middle of a sentence." "Take a new coherer!" "I've tried four."
The Hertzian waves wouldn't be strong enough to work a great heavy Morse instrument like ours. Let me make it clearer. Do you know anything about steam?" "Very little. But go on." "Well, the coherer is like a steam-valve. Any child can open a valve and start a steamer's engines, because a turn of the hand lets in the main steam, doesn't it?
The fine dust-like silver and nickel particles in the coherer possessed the quality of high resistance, except when charged by the electric current of the ether waves; then the particles of metal clung together, cohered, and allowed of the passage of the ether waves' current and the strong current of the local battery, which in turn actuated the Morse sounder and recorder.
Then this wire of yours sticking out into space on the roof of the house in some mysterious way gets charged with those waves from Poole " "Or anywhere it only happens to be Poole tonight." "And those waves set the coherer at work, just like an ordinary telegraph- office ticker?" "No! That's where so many people make the mistake.
So Marconi invented a little device which was in circuit with the recorder and tapped the coherer tube with a tiny mallet at just the right moment, causing the particles to separate, or decohere, and so break the circuit and stop the local battery current.
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