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Updated: May 19, 2025
Whether we are picking it up, or paying it out; whether it is lying inert, coil upon coil, in the tanks like some great gorged anaconda, or gliding along the propelling machinery into some other tank, or off into the sea at our bow or stern; whether the dynamometer shows its tension to be great or small; whether we are grappling for it, or underrunning it; whether it is a shore end to be landed, or a deep-sea splice to be made, the cable is sure to develop most alarming symptoms, and some learned doctor must constantly sit in the testing-room, his finger on the cable's pulse, taking its temperature from time to time as if it were a fractious child with a bad attack of measles, the eruption in this case being faults or breaks or leakages or kinks.
To put it in another way, the errors in the use of dynamometer are due to the vibration of the spring which measures P, and are caused by variations of the coefficient of friction of the dynamometer. By making P very much smaller than in the usual form of the dynamometer, any errors in determining it have much less influence on the measurement of the work absorbed. We may go further.
If I had thought to bring along a spring dynamometer, I could have shown you, Jack, that when we were 4,000 miles above the earth's surface the 200 good pounds with which you depress the scales at home had diminished to 50, and that when we had passed about 150,000 miles into space you weighed no more than a couple of ounces.
And now a third sound came to his ears, the note of the turbine, low at first, but gradually rising like the scream of a siren, and the floor of the Ring beneath his feet throbbed with the vibration. Bennie forgot the dynamometer, forgot his message to Burke, was conscious only that he had wakened a sleeping volcano.
Five different trials were made at varying speeds of the driving shaft; the initial work on this shaft was measured by a dynamometer, and the available energy of the shaft of the receiving machine was ascertained by a Prony brake; the other results of the experiments were deduced from the constants of the machines and from galvanometric measurements.
They had a bite, and everyone on board watched with interest the heavy machinery as it slowly and steadily pulled the sea end of the cable out of the water. It was hooked at half after eight, and not until an hour later was it landed, the dynamometer showing a strain at times of from one to two tons.
Then I find the consumers of nothing but the salted and dried article insist that it is poisonous, simply because it is alive, and cry out to people not to touch it. I have not found, however, that people mind them much. The poor boarder in bombazine is my dynamometer. I try every questionable proposition on her. If she winces, I must be prepared for an outcry from the other old women.
As for myself, I saw at once that others besides ourselves were keenly interested in this robbery. "There," remarked Kennedy when at last he had finished packing up the dynamometer into two packages. "At least, Mr.
Science has quite enough trouble in measuring its material motions without volunteering help to the historian, but the historian needs not much help to measure some kinds of social movement; and especially in the nineteenth century, society by common accord agreed in measuring its progress by the coal-output. The ratio of increase in the volume of coal-power may serve as dynamometer.
Peron, who first used, if he did not invent, the little instrument, the dynamometer, or muscular-strength measurer, subjected persons of different stages of civilisation to the test of his gauge, and discovered that the strength of the limbs of the natives of Van Diemen's Land and New Holland was as 50 degrees of power, while that of the Frenchmen was 69, and of the Englishmen 71.
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