Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 203
assumed, and the note is higher than the former. By damping with two finger-tips the form c is obtained and a much higher note is produced. The sand is tossed away from certain parts of the surface and collects along the nodal lines, that is, those portions which are at rest. Some of the forms… … Fio. 221.—Sand-figures showing nodal lines invibrating plates. VIBRATIONS OF AIR COLUMNS; RESONANCE 198
Physics
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