Inside Out Library
A text-book on sound (1908)
Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 458
Fig. 89a.—Bellys Motion.Magnified 260 times that of string. … Fig. 89b.—Airs Motion.Magnified 1400 times that of string.Sound
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
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