Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 335
he ear of the tyrant, even the whispers of the victims there con-fined. The external ear is a sound condenser. The hand held concavebehind the car, by its increased siufacc; adds to its efficiency. An ear 312 SOUND. trumpet, by successive reflections, serves to concentrate, at the smallorifice… … 4 distant, and then introduce a collodion balloon B filled withcarbonic acid gas between your ear and the watch, and verynear the latter, the sound becomes much louder.. Tiic cause is olivioiis; for, let the curved lines a, b, c, etc., representsections of sound-waves with convex fronts, and B a…
Physics
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