Results of experiments on the vibrations of pendulums with different suspending strings / by W.J. Frodsham.
- Frodsham, William James, 1778-1850.
- Date:
- [1839]
Licence: Public Domain Mark
Credit: Results of experiments on the vibrations of pendulums with different suspending strings / by W.J. Frodsham. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![From 1° O O in 21m. 45s. Do. do. 22 45 Do. do. 22 0 Do. do. 22 30 Do. do. 23 0 Mean . . 22 24 The mean of the two preceding corresponding results is 23m. 12s. The difference may be satisfactorily accounted for, by the difficulty of setting off the pendulum at the precise point intended, and of noting the time when the arc is diminished to the proposed quantity. It is apparent from these experiments, that when a pendulum is freely suspended, and left - to vibrate from its own gravity, the arc of vibration is sooner reduced from 2° to 1°, than from 1° to i°, as might indeed be anticipated from the increased resistance experienced by the bob, while moving through a greater space in the same time. I attached the pendulum, suspended as before, to a clock, with a maintaining power of 6lb. 8oz., but the clock stopped in 39 minutes; and setting it off again, it stopped in 43 minutes; but on applying a weight of 6lb. lloz., the clock continued to go; thus showing that a weight of 61b. lloz. was sufficient to keep the pendulum in vibration, while one only 3oz. lighter was not. The arcs of vibration in the preceding experiments being smaller than is desirable in practice, I proceeded to experiment with heavier weights, the pendulum being still suspended by the parallel silk threads, noting in each case the arc of vibration and the rate of the clock, viz., its gain or loss in 24 hours. In the following experiments each succeeding pair is to be considered as giving the results for two consecutive days, though more than one day occasionally elapsed between the times at which the sets were taken. Weight. Arc of Vibration. Rate. 141b. 6oz. 2° 3' — 9s-O] 8 0 1 30 + 0 *7/ —10 -0) 0 -oi 14 6 8 0 2 3 1 30](https://iiif.wellcomecollection.org/image/b22326972_0007.jp2/full/800%2C/0/default.jpg)
