Abstract
WITH regard to the subject of “Forced Vibrations” dealt with by Prof. Perry in his letter in NATURE of June 27 (p. 424), Prof. E. H. Barton, of Nottingham, puts the matter very clearly on p. 150 of his “Text-book of Sound,” 1908, where he states:—“The frequency of the impressed force to make the amplitude a maximum is lower than that natural to the system with friction, while the frequency of the impressed force to make the kinetic energy a maximum is above that natural to the system with friction, and equals that if friction be absent.” “Moreover, the squares of these three frequencies form an arithmetical progression whose common difference is proportional to the square of the damping coefficient.”
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DUNK, J. Forced Vibrations. Nature 89, 477 (1912). https://doi.org/10.1038/089477c0
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DOI: https://doi.org/10.1038/089477c0
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