Wright, Mark R., 1854- · London : Longmans · leaf 65
uum.—Each vibration of asonorous body gives a push to the air, and the air transmitsthe pushes to the ear; the air, or some other medium, is essential.When an alarum is rung under the receiver of an air-pump, theair being exhausted, scarcely any sound can be heard. If theair could be completely… … Fig. 42. A strong flask is provided with a good india-rubber cork havingtwo holes (fig. 44). A piece of glass rod,passes through one hole,and is connected with a toy bell by indi3.-rubber tubing. Thecork is inserted, the bell rung by shaking the flask, and thesound produced noted. The bottom of the…
Physics
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