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180                    HAND-BOOK OF ACOUSTICS.
4 beats per second will be produced.
A Fourth is not so well defined as a Fifth, for not only are the coincident partials of a higher order, and therefore not so prominent in the former case, but also the dissonance between the 3rd and 2nd partials (s and f in the above) masks, to a certain extent, the beats between the 3rd and 4th partials of this interval, when not exactly in tune.
Major Third. Let d| = 4?? and ri| = on be the vibration numbers of two Compound Tones at this interval; then,
the oth partial of the lower tone will exactly coincide with the 4th of the higher one. Thus a Major Third is even more ill-defined