Acoustic echo

Acoustic echo

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Illustration from "The Artisan; or, the Mechanic's Instructor" London 1825, edited by George G. Carey. The sound wave ac is reflected at d by the oblique wall causing an echo to be heard at m. The mathematical theory of sound wave propagation was begun by Isaac Newton. During the 18thc it was developed further by Euler, Lagrange and d'Alembert and their work still forms the basis of today's modern theories on the wave propagation of sound.

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Keywords: acoustics, d'alembert, echo, euler, lagrange, newton, sound, sound wave propagation, sound waves

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