The sphygmograph : its history and use as an aid to diagnosis in ordinary practice / by R.E. Dudgeon.

  • Dudgeon, R. E. (Robert Ellis), 1820-1904.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: The sphygmograph : its history and use as an aid to diagnosis in ordinary practice / by R.E. Dudgeon. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    invention, where a pad placed on the radial artery acts on an upright piece like a fiddle- bow, the string of which passes over a small wheel, which in its turn moves a larger disc, on the edge of which is a pencil that, as the wheel moves, makes a magnified representa- tion of the arterial movements on a strip of paper moved by clockwork. This apparatus being all in the air, must be difficult of appli- cation and deficient in stability. L. Waldeuburg* invented a pulse-clock, a complex machine which registers the move- ments of the artery on a dial, in appearance something like a clock-barometer. It does not give a graphic tracing of the pulse. Marey'sf sphygmograph consists of a long spring furnished with a pelotte or button, which is fastened over the radial artery. The movements of the spring are communicated to a long lever, furnished with a style or pen that traces the movements communicated to it * Die Messung des Pulses und des Blutdrucks. Berlin, 1880. f La M4thode graphique dans Us Sciences experimentales, par Etienne Jules Marey. Paris, 1878.