Sound : an elementary text-book for schools and colleges (1913)
Capstick, John Walton, 1858- · leaf 107
stories of churches where one can hear at certainpoints what is said in distant confessional boxes. If thestories are true, it is probable that the sound of the voices iscollected by some curved surface and concentrated at adistant point. 96 REFLECTION [CH. VI 120. Whispering Galleries.… … Pig. 47 If a person at any point A puts his head close to the walland whispers, the whisper can be heard at any part of the gallery,if the listener also places his head near the wall. This is nota case of the concentration of the sound at a focus, for thewhisper can be heard almost equally well at…
Sound
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
