Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 123
aried by the room and objects in it, as the audience,chairs, tables, etc. When empty, the room seems to ring.This is called resonance, and occurs when the walls arenot so far distant as to produce an echo. The original syl-lables and the reflection commingle and the reflection addsto the effect.… … Fig. 110. end. The trumpet is directed to the point to which it isdesired to send the sound, and the waves undergo a seriesof reflections so that they are all nearly parallel when theyissue from the mouth. The bell at the same time strength-ens the sound, in some way not fully explained. 400. The…
Physics
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-43-9.webp)
