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Updated: May 2, 2025
"The magnetic arrangement is to cut short the vibrations set up in the pendulums, to prevent them from continuing to vibrate after the first shock. Thus they are ready in an instant to record another tremor. Other seismographs continue to vibrate for a long time as a result of one tremor only. Besides, they give little indication of the direction from which the tremors come.
At 10: 23 A.M. today, the village of Bankerville, about thirty miles north of this place, was totally destroyed by an explosion of such terrific violence that seismographs all over the world recorded the shock, and that windows were shattered even in this city. A thick pall of dust and smoke was observed in the sky and parties set out immediately.
Turning to the Far East, across the Pacific, seismographs in the Imperial University of Tokio showed that the earthquake was felt there eleven minutes later than in San Francisco, and similar instruments in Manila detected the arrival of the seismic waves twenty minutes after the San Francisco shock.
All the seismographs that have hitherto been employed have two grave disadvantages: they are either too simple, so that their indications are valueless, or too complicated, so that their high cost and delicacy, and the difficulty of mounting them and keeping them in order, tend to prevent them from being generally used.
Arcot had snapped the loud speaker into the circuit once more, and now as they looked at the sudden crash below, there thundered up to them mighty waves of sound! The giant plane had struck about twenty feet from the top of a nearly perpendicular cliff. The terrific crash was felt by seismographs in Sonor nearly two thousand miles away!
"I compared the records of all the seismographs that had registered the earthquake wave attendant on the electrical discharges accompanying the great yellow auroras of July. These shocks had been felt all over the globe, and I secured reports from Java, New Guinea, Lima, Tucson, Greenwich, Algeria, and Moscow. These showed the wave had originated somewhere in Eastern Labrador." "Yes, yes.
How widely this may really have made itself felt it is not possible to say. Several of the great earthquakes in Japan have been recorded in the seismographs of the observatories on every continent and in Australia, showing that in severe disturbances of this kind the whole surface strata quiver, alike under the oceans and over the continents and islands.
Why should their apparitions content themselves with announcing the decease, at the Antipodes, of profoundly uninteresting relatives? Alas! I begin to perceive that spirits of the right kind, of the useful kind, have yet to be discovered. Our present-day ghosts are like seismographs; they chronicle the event after it has happened. Now, what we want is "The Signore smokes, and smokes, and smokes.
My computations show that these great circles of magnetism centre at approximately the same point in Labrador as that indicated by the seismographs about fifty-five degrees north and seventy-five degrees west." The general seemed struck with this. "Permanent deflection, you say!" he ejaculated. "Yes, apparently permanent.
The most powerful seismographs in the world are in this university. I saw a record of the San Francisco earthquake that was made by these instruments just when it started, when it was at the worst, length of time it lasted and all about it. Here in this building is a picture of a place where, during an earthquake, the ground was opened and a lot of people had fallen perhaps a hundred feet down.
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