Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 41
ter distance,say to a! and h. Soon afterwards the two halves of thewave will cross each other, or in other words come to afocus, the air at the focus being agitated by the sum ofthe motions of the two waves.^ A more complete mode cf illustrating the refraction of sound isdescribed in Lecture VI. 2… … DIFFRACTION OF SOUND; ERITH EXPLOSION. 21 § 7. Diffraction of Sound: illustrations off^ered bygreat Explosions, When a long sea-roller meets an isolated rock in itspassage, it rises against the rock and embraces it allround. Facts of this nature caused Newton to reject theundulatory theory of…
Sound
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