Results of experiments on the vibrations of pendulums with different suspending strings / by W.J. Frodsham.

  • Frodsham, William James, 1778-1850.
Date:
[1839]
Catalogue details

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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    Weight. Arc. Rate. 41b. loz. 2° 15- 4s *0) 2 2 1 39 — 4 *25 4 1 2 15 — 5 -O'! 2 2 1 39 — 5 -2/ 4 1 2 15 — 5 -O'! 4 1 2 15 — 5 -Oj Showing that even with different lengths of this spring, the vibration of the pendulum may be considered as isochronous, with considerably different arcs of vibration j and also that with this spring, a greater arc of vibration is produced with the same maintaining power, than with any other spring that has been tried. Spring No. 4 was next applied without maintaining power. With it the arc of vibration was reduced from 2° to 1° in Ih. 47m. do. 1 48 do. 1 50 1° to r 1 54 do. 1 55 do. 1 58 do. 2 0 Applying maintaining power of 4lb. loz. and 2lb. 2oz. respectively, with *97 inch effective length of the spring, the following results were noted : Weight. Arc. Rate. 41b. loz. 2° 6' —2s -5 2 2 1 30 + 1-2 Even with this comparatively stiff spring, the arc of vibration is greater with a maintain- ing power of 41b. loz., than it was with 14lb. 6oz., when the pendulum was suspended by two parallel silk threads. But the rate appears to vary more with the arc of vibration, than it did when No. 3 was used. Reducing the length of this spring to *66 inch, the following results were obtained :