HANDBOOK OF ACOUSTICS - online book

A complete view of Acoustical Science & its bearings on music, for musicians & music students.

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THE ORIGIN OF A MUSICAL SOUND.               7
point of the heated rocker on one side of the groove touches the lead, it imparts its heat to the latter at that spot. This causes the lead at that particular point to expand. A little pimple, as it were, darts up-and pushes the rocker back (fig. 6), so that it falls over on
Fig. 6.
to the other side of the groove. A second heat pimple is raised here, and the rocker is tilted in the contrary direction, and thus the motion is continued, as long as the rocker is sufficiently hot.
Summary.
The cause of the sensation sound, is motion.
A musical sound is one which remains steadily at a definite pitch.
A musical sound originates in the periodic motion of some body.
A periodic or regular vibratory motion will always give rise to a musical sound, if the vibrations recur with sufficient, but not too great rapidity, and provided they are extensive enough.