Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 179
s air, in its vibration, causesthe air surrounding it to vibrate, which in turn givesmotion to the air beyond it, and so on. In this way theair in contact with the ear is finally set in vibration andthe sound of the fork is heard. 5. Reflection of Sound—Echoes.Experiment 9. Cut from a sheet of… … time blow on a toy trumpetheld inclined to the plane ofthe disc, while another per-son goes to a distant part ofthe room and describes theFlG- 14°- changes which he observes in the sound given out by the trumpet. Is the effect different when the observer stands in different partsof the room ? The…
Physics
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