Text: "A rod fixed at both ends and caused to vibrate transversely divides itself in the same manner as a string vibrating transversely. But the succession of its overtones is not the same as those of a string, for while the series of tones emitted by the string is expressed by the natural numbers, 1, 2, 3, 4, 5, etc., the series of tones emitted by the rod is expressed by the squares of the odd numbers, 3, 5, 7, 9, etc." "Sound" by John Tyndall

See Also:

Source: 6