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38 HOPI SONGS
these were signs of its exhaustion. I continued the tests, nevertheless, in order to ascertain what form the aberrations of the phonograph would take under these conditions. While the beats still kept during a good part of the reproductions within limits approximately those just determined, there were constantly recurring moments of much wider change of rapidity. They would suddenly quicken into a whirring sound, returning after a few seconds to approximately the former rate. On listening to the tone, the absolute constancy of the earlier trials had given place to occasional marked unevenness of pitch. The following are such fragmentary notes of the course of the beats as I was able to take; tests united by a brace signifying as before continuous series of reproductions: — |
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