Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 353
, and the vertical line MN is described by thespot of light on the screen. If, on the other hand, withoutany sound being produced the mirror J is rotated about itsvertical axis, we should have the horizontal line KLdescribed by the spot of light on the screen. When, how-ever, the sound is directed… … <ti
Sound
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