Turner, H. H. (Herbert Hall), 1861-1930 · London, E. Arnold · leaf 244
sults ofsuch a composition are well known in severaldifferent branches of physics, especially in thetheory of sound. If two notes of nearly the samepitch be struck at the same time, we hear theresultant sound alternately swell and die away,because the vibrations caused by the two notes interfer-are… … Fig. 8. upper wave goes through its period seven anda half times between A and D, the lower onlysix times; and it is easily seen that at A and Cthe waves are sympathetic, at B and D anti-pathetic. At A and C the compound vibrationwould be doubled ; at B and D reduced to insensi-bility. The point is…
Astronomy
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