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Updated: June 12, 2025
Strike the G next above the C, and you get a note resulting from strings vibrating half as many times again per second as did the C strings that is, the relative rates of vibration of notes C and G are the same as those of pendulums A and B namely, as 2 is to 3.
On November 22nd, 1820, he notes in his journal that he had begun Newton's "Principia": he commenced also the study of astronomy by observing eclipses, occultations, and similar phenomena. When he was sixteen we learn that he had read conic sections, and that he was engaged in the study of pendulums.
Don't ask people with weak lungs to try experiments with the apparatus described in this chapter. Have you ever heard of the harmonograph? If not, or if at the most you have very hazy ideas as to what it is, let me explain. It is an instrument for recording on paper, or on some other suitable surface, the figures described by two or more pendulums acting in concert.
Not on any sanctioned by the Method of Difference; for one of the two instances, the negative instance, is wanting. Nor by the Method of Agreement; for though all pendulums agree in this, that during their oscillations the earth is always present, why may we not as well ascribe the phenomenon to the sun, which is equally a co-existent fact in all the experiments?
The boxes hanging by eleven feet, made a couple of pendulums exactly equal in weight and figure, and equally receiving the resistance of the air. And, placing the one by the other, I observed them to play together forward and backward, for a long time, with equal vibrations.
"There are two of them at the store." "To be sure there are! For the moment I had forgotten that." "And all this time while clockmakers were fussing round about bobs and pendulums, did the people have to keep on running to the cathedral or the public square to find out what time it was?" "No, indeed! By 1600 you could buy for a moderate sum a clock to use at home.
You will recall that early in clock history there were some pendulums of a very unsatisfactory nature in use pendulums that were regulated by weights and dangled at the back or across the front of old brass clocks." "I remember, yes."
Galileo found, for example, that a pendulum of a given length performs its oscillations with the same frequency though the arc described by the pendulum be varied greatly. He found, also, that the rate of oscillation for pendulums of different lengths varies according to a simple law.
Koupriane gave me that advice one day when he was here and had pricked his ears at the noise of the pendulums, to stop all my watches and clocks so that there would be no chance of confusing them with the tick-tack that might come from an infernal machine planted in some corner.
When Huntsman had perfected his invention, it would naturally occur to him that the new metal might be employed for other purposes besides clock-springs and pendulums. The business of clock-making was then of a very limited character, and it could scarcely have been worth his while to pursue so extensive and costly a series of experiments merely to supply the requirements of that trade.
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