Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 88
ridges can be set in motion if the even step of thosecrossing the bridge coincides with the natural free periodof the bridge. For this reason, soldiers break step whilecrossing bridges. One tuning fork will be set in vibration by another, ifthey have the same natural free period. This is true of… … HOW WE HEAR 77 85. The Ear. — The ear is the instrument with whichwe receive sound. The receiving is done in accordancewith the principle of resonance. Figure 58 shows a sectionof the ear. The part (a) is that which we can see outside thehead, and is called the external ear. From this a tube…
Physics
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