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36 HOPI SONGS
Still, as far as I could judge, these ephemeral changes did not represent a variation extending much if at all beyond the limits expressed in the above figures. To verify these results, I made in the afternoon of the same day two more quadruple series of reproductions, the conditions of the experiment remaining the same, excepting that now I counted the beats only in alternate ten seconds of the reproductions. The intermediate spaces (during which I had occasion to notice no marked divergence from the rates counted) I employed in writing down the number just counted, in assuring myself that what I was counting was really the beats and not any pulsations of sound from the phonograph, and in tapping the fork again. In Series II and a single reproduction observed after it, the sequence of beats was the following: — |
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Series II |
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Individual variations, |
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Total variation in Series II, 1.2 vibr. = 8c. These results are almost identical with those of Series I.
Before the fifth reproduction I turned the regulator screw down, slightly-diminishing the electrical supply. The slowing of the beats which followed shows that the phonograph note was in this trial above the fork Ut3 in pitch.
This second attempt to watch the beats closely during several reproductions, made under conditions more favorable to the correctness of the observations than I had before devised, revealed the same quickening from the beginning to the end of the cylinder that was noticeable in the first series. The other form of inconstancy, an occasional hurrying or slowing within the ten second spaces, was also again remarked. While this time I judged it to represent a somewhat larger range of momentary variation in pitch than is exhibited in the above figures, it was never sufficient to interfere with the easy counting of the beats. In both these series, especially noticeable is the close return of the phonograph to one pitch each time the diaphragm was brought again to the head of the cylinder. The four initial vibration rates in 1 differed (leaving out 23) by |
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