HANDBOOK OF ACOUSTICS - online book

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

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4                        HAND-BOOK OF ACOUSTICS.
another faster and faster, till at length a musical sound is heard. Although we cannot now follow the rapid motion of the strip, yet, as in the case of the string above, we may fairly conclude that its character remains unaltered; that is, the motion is still periodic.
In such an instrument as a flue pipe, the vibrating body is the air. Although this itself is invisible, it is not difficult to render its motion visible. Fixed vertically in the stand (fig. 3) is a glass
tube A B, about 2ft. long and an inch in diameter. Passing into the lower end of the tube is a pin-hole gas jet, (/), joined to the ordinaiy gas supply by india-rubber tubing. Before the jet is introduced into the tube, it is ignited, and the gas turned down, until the flame is about an inch or less in height. On inserting this into the glass tube, after a little adjustment, a musical sound is heard coming from the tube. It is, in fact, the well-known singing flame. The particles of air in the tube are in rapid vibration, moving towards