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THE PHONOGRAPHIC METHOD 41
5" from the beginning and lasting perhaps 3", the second about halfway through the reproduction and lasting perhaps 5". The first time I estimated the rate of beating at about 50 in ten seconds; the second time they became a whir, and to the ear the note was flatted perhaps
![]() tion of these two irregularities the reproductions were, as the figures show, extremely correct, their average variation being about
![]() ![]() I concluded to make another trial with Cylinder B, the tone of which, though almost lost to the ear, might still be strong enough to make beats that could be counted. The point of interest was to discover whether, with a comparatively fresh battery, the sharping persisted. A quadruple reproduction gave the following figures, the beats being perfectly distinct: — |
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The variations of the individual reproductions were almost identical with those of Series I-III, viz., not below 5c nor over 7c (the fourth of Series I was but 3c, and the first of I and the fifth of II were 4c) ; and the total variation of the whole ten minutes was for the third time
![]() Moreover, in each reproduction the note was at its lowest at first and its highest at last. But in the last two reproductions there was a decided lapse just before the end in the continuity of the rise. Within the ten second spaces the rate of the beats varied slightly, as before, from these figures, now hurrying and now slackening. |
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