Stewart, Balfour, 1828-1887 · Toronto : James Campbell · leaf 69
ry curious expeiimcnt is that which ia 58 SCIENCE PRIMERS. [vibrating shown in the following figure. Place two large hollowreflectors at some distance from one another, and in apoint called tlie focus of the one put a watch, whileyou place your ear in the focus of the other; you willthen hear the… … Fig. 22. it indirections which bring them to the other reflector,from which they are then all reflected into the ear.All this is shown in the figure. This property ofsound makes a very nice experiment, but it has some-times proved inconvenient in practice : for instance, inthe Cathedral of Girgenti…
Physics
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