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Updated: May 12, 2025
When the seismograph has been arranged according to such directions, no matter from what part the first horizontal shock comes, one of the four pendulums will be set in motion.
The sounds of restless animation, intenser in the night, as if the moon were mistress here, and wakened every insect brain and tongue to industry, grew prodigious in the sick girl's ears, and seemed to deaden every word her male companion had to say, and, like enormous pendulums of sound, the roaming crickets and amphibia swung to and fro their contradictions, like viragos doomed to wait for eternity, and each insist upon the last word to say: "You did!"
We used the telephones almost daily for taking time, and Simpson used to stand inside the hut at the sidereal clock whilst I took astronomical observations outside in the cold. We also telephoned time to the ice cave in which the pendulums were being swung when determining the force of gravity. Telephones were quite efficient in temperatures of 40 degrees and more below zero.
One is by the measurement of arcs on the earth's surface; the other is by experiments with pendulums or weights with regard to the earth's gravity at different places. The former of these methods is, perhaps, the more satisfactory. Measurements of arcs have been made on a very extensive scale in different parts of the world in England, France, Lapland, Peru, and India. Mr.
If the hypercritick will go upon this; and is resolved after all to take a pendulum, and measure the true distance betwixt the ringing of the bell, and the rap at the door; and, after finding it to be no more than two minutes, thirteen seconds, and three-fifths, should take upon him to insult over me for such a breach in the unity, or rather probability of time; I would remind him, that the idea of duration, and of its simple modes, is got merely from the train and succession of our ideas and is the true scholastic pendulum, and by which, as a scholar, I will be tried in this matter, abjuring and detesting the jurisdiction of all other pendulums whatever.
The cards on which designs have been drawn are in great request, so that the pleasure of the entertainment does not end with the mere exhibition. An album filled with picked designs, showing different harmonies and executed in inks of various colours, is a formidable rival to the choicest results of the amateur photographer's skill. Practical Instructions for making Harmonographs. Pendulums.
"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.
He was dressed in what seemed to be black, but was in reality gray, almost as good as black, and much more thrifty. He came down the hill swinging his arms, like opposing pendulums, in a manner that made the rapid pace at which he approached like a long slow trot.
But the interest of the harmonograph centres round the fact that the periods of the pendulums can be tuned to one another. Thus, if A be set to swing twice while B swings three times, an entirely new series of figures results; and the variety is further increased by altering the respective amplitudes of swing and phase of the pendulums.
During that period many adventures of a more or less exciting nature befell them, which, however, we must pass over in silence. At the end of that time, the youth who had been sent for the Captain's sextant and other philosophical instruments arrived with them all thermometers, barometers, chronometers, wind and water gauges, pendulums, etcetera, safe and sound.
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