Tyndall, John, 1820-1893 · New York, Collier · leaf 185
f brass, 12inches square, and supported on a suitable stand. Damp-ing it with the finger and thumb of my left hand at twopoints of its edge, and drawing the bow with my rightacross a vibrating portion of the opposite edge, the com-plicated pattern represented in Fig. 67 is obtained. The beautiful…
Sound
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