On the rhythm of the sounds of the heart / by F. C. Donders, M.D. ; translated from the "Nederlandsch Archief voor Genees en Natuurkunde," Utrecht, 1865, by William Daniel Moore, M.D.

  • Franciscus Donders
Date:
[1868]
Catalogue details

Licence: Public Domain Mark

Credit: On the rhythm of the sounds of the heart / by F. C. Donders, M.D. ; translated from the "Nederlandsch Archief voor Genees en Natuurkunde," Utrecht, 1865, by William Daniel Moore, M.D. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    a OT A is alterately reproduced: in the upper tracings the ^'s here imitated, especially the second, are too great, because II occurs too soon, / on the contrary scarcely too soon or even too late—as in the lower tracings the a' are too small, because I occurs too late and II too early. We have therefore here a rather considerable personal error, which with me returns each time, modified however by the values of F and of «: P. Of these results, I here append more than is absolutely necessary for estimating the degree of accuracy attained in registering the rhythm of the cardiac sounds. I do so because the question, what accuracy is attainable, is in a psycho-physical point of view, in itself not without im- portance, and moreover the method of the indirect registration of sounds will, in other cases also, find application. We should therefore know what it is capable of. Now, in the first place, the observations, which belong to one and the same circuit of the cylinder, present a slight probable error. Some examples may illustrate this. METRONOME IMITATION No. Period P=-5V' a Period P' o' 1 1 9'Q A..K 2 18-5 6-8 18-7 7-4 Q . O 21- 8- 21-3 8-4 4 24-2 10. 24-3 9-8 5 25-8 10-3 25-5 9-9 6 26- 10-5 25-9 11- 7 26-6 10-6 27-2 10-6 8 27-1 11- 27-3 10-6 9 27-4 11-3 26-7 10-3 10 27-6 12- 28-4 11-8 11 28-3 11-8 27-8 10-9 12 27-4 11-5 27-1 10-7 13 27-2 11-5 26-6 10-5 14 28-3 12-7 28- 10-8 15 26-5 10-7 27-8 11-1 16 26-4 11- 26-6 11-5 17 26-9 11- 24-7 9-5 18 26-4 10-4 27-2 10-7 19 26-4 10-9 26-4 10-9 20 26-8 10-9 26-8 11-2 21 27-3 10-3 27-6 11-2 22 27-4 10-9 26-3 11- 23 26-8 10-7 27-4 11-6 636-3 220- 535-1 215-6
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