A textbook of human physiology / translated from [the] 6th German edition by W. Stirling.

  • Landois, Leonard
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: A textbook of human physiology / translated from [the] 6th German edition by W. Stirling. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    151/980 page 99
    artery by means of the inillod lieud, L. This must be determined for each pulse, but the rule is TO graduate the pressure until the <,'reatest ami.litude of movement of the lever is obtained, set the clock-work going, and a tracing is obtained, which must be fixed by dipping it in a rapully drying varnish, e.^., photographic. In every case scratch on the tracing with a needle the name, date, and amount of pressure eniployed ] [(o) Dudgeons Sphygmograph.-This is a convenient form of sphygniograph, although Jiroadbent regards its results as untrustworthv. Tlie instrument after being carclully adjusted Fig. 74. Ludwig's sphygraograph. upon the radial artery is kept in ])osition by an inelastic .strap. The pressure of the spring is regulated by the eccentric wheel to any amount I'lom 1 to 5 ounces. As in othei' instruments Fig. 75. Dudgeon's sphygniograph. the tracing paper is moved in front of tlie writing-needle by means of clock-work. The writing- levers are .so adjusted that the movements of the artery are magnified fifty times (fig. 75).] (6) [Ludwig's improved form is a very serviceable instrument (fig. 74).] (7) Marey's tambours are also employed for registering tlie movements of the pulse. They are used in the same yvay as the pansphygmograph. Two pairs of metallic cups (fig. 76, S, S,
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