Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 92
e for generating fresh impulses in every direc-tion, and that sound passes through equal distancesin equal times. Then, if the sum of the right lineswith their reflections be equal to one another, thetimes will be equal; that is, if the pulses which di-verge in right lines from a given point, be… … If aerial pulses be propagatedfrom the point a, and strike variouspoints of the curve cdefg, and thesums of the respective lines takentogether at b, be equal to one ano-ther ; that is, ac4«cb=ad+db, andad+db=ae+be, &c. then the echoor reverberation of sound will beheard at b, as a common…
Physics
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