IN this second edition Dr. Oliver has carried the subject of clinical pulse gauging a distinct step forward. Not only has he greatly improved his compressed-air manometer, but he has made further clinical observations on blood pressure, and he presents the subject in a series of generalisations which cannot fail to be of practical value. The alterations he has effected in his instrument concern each of the three portions constituting it—the glass tube, the armlet, and the apparatus for regulating the air pressure in the tube. This latter is now closed at the distal end, thereby doing away with the necessity for a tap, and effectually avoiding leakage. The armlet no longer consists of a gutta-percha bag which completely encircles the limb, but of a canvas bag, constructed to encircle the limb partially, and provided with three straps; this is a great improvement on the older contrivance, admitting, as it does, of ready adjustment to the limb. Finally, instead of regulating the air pressure by a ball-pump, which causes the index to move along the tube in a series of bounds, Dr. Oliver now employs a compressor fashioned concertina-wise, the size of the chamber being controlled by means of a screw passing between the two boards constituting respectively the top and the bottom, an arrangement which enables the air pressure to be regulated with great evenness and nicety.
Studies in Blood Pressure: Physiological and Clinical. Second edition, enlarged.
By Dr. George Oliver. Pp. xii + 255. (London: H. K. Lewis, 1908.) Price 4s. net.
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Studies in Blood Pressure: Physiological and Clinical Second edition, enlarged . Nature 78, 77 (1908). https://doi.org/10.1038/078077a0