Tyndall, John, 1820-1893 · New York : Appleton · leaf 170
over, may be doubled by employing two candles insteadof one. Two spots of light then appear, each of which 164 SOUND. describes its own luminous line when the knitting-needlais set in vibration. In a subsequent lecture we shall be-come acquainted with Wheatstones application of hismethod to the…
Sound
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