Poynting, J. H. (John Henry), 1852-1914, Shakespear, Gilbert Arden, ed, Barlow, Guy, joint ed · Cambridge, University Press · leaf 676
nts are so great, that it wouldbe extremely difficult to observe its effect directly. It occurred to us thatwe might call in the aid of the principle of forced oscillations, by turningone sphere roimd and round at a constant rate, so that the couple wouldact first in one direction and then in the… … Fig. 9. Experiment on directive action of one quartz crystal on another. sphere, the greater would be the vibration set up. This is well illustratedby moving the point of suspension of a pendulum to and fro in graduallydecreasing periods, when the swing gets longer and longer, till the period…
Poynting, J. H. (John Henry), 1852-1914 · Physics
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