Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
of a sentence willbe heard. If the distance be twice, thrice, etc., as far, then there willbe echoes of two, three, etc., of the last syllables. The direct soundand reflected sound of the other syllables will be confounded with eachother. 54^. Figure 3.—Multiple echoes.—The same sound may… … A, it will radiate in all directions toward the opposite wall. In pass-ing to B, it will be reflected back to A; in passing to T, back to S,whence it will be again reflected to F and back again to H, and so on.If the wall BF be nearer to the wall AH, as in the position of the lineKL, the number of…
Physics · Astronomy
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