Clinical manual for the study of medical cases / edited by James Finlayson.

Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Clinical manual for the study of medical cases / edited by James Finlayson. 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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    the band steady, with the knuckles touching the table or bed, and having placed the button, which the spring. carries at its free extremity, immediately over the artery, we hiicklft tlie.instru- uient to the cushion by means of a band of elastic braid. If the spring is not accurately adjusted over the artery, we may shift it about a little without undoing the instrument, but generally it is preferable to apply the sphygmograph afresh. ^Aiter the spring is adjusted, we connect it with the lever, and see that it is working properly, before any ati:;mpt is made to register the tracing on paper. Great care must be taken that the spring is fairly saddled on the artery, the least deviation to the side deforming the tracing. The pressure must also be very nicely regulated. A number of tracings with varying degrees of pressure should be taken at a time and the most perfect selected. The slips on which the tracings are to be taken may be pre- pared in several ways; a very easy method is to blacken the paper in the smoke of a turpentine flame from a paraffin lamp—foreign note paper answers the purpose very well— and when the tracings are taken, the patient's name and the date, with the pressure employed, may be written on them with a needle or other sharp point, and they are then varnished by dipping them in a solution of shellac in rectified spirits. In Marey's instrument, the tracings may be written with pen and ink, but the above method gives more delicate results. Smoked glass may also be used instead of paper. The following are the names applied to the various parts of a ])ulRe tracing:— a A I'lg 8. a Primary or Percussion Wave, b Secondary or Tidal Wave, e Aortic Notch, c Dicrotic Wave, d Fourth Wave.
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