ABSTRACT
Having become the professor of experimental philosophy at King’s College London in 1834, one of Wheatstone’s first tasks was to design a lecture series on sound. In this venture, he was determined to provide the most complete overview of sonorous phenomena to date. As he put it in a letter to John Herschel in May 1835, Wheatstone had “just concluded a course on Sound, in which the author endeavoured to include every experimental investigation which has hitherto been made in this department of physics”. When the same sound is heard more than once it is called echo. An echo is produced when the sound in the course of its propagation meets with an obstacle of sufficient extent and regularity, and at a sufficient distance to prevent the repetition from being confounded with the original sound.
