Studies in blood-pressure : physiological and clinical . ndoscope over theend-piece of a stethoscope are: (1) increasedsensitiveness; (2) avoidance of pressure, andespecially of variable and uneven pressure overthe artery ; and (3) liberation of the finger of theleft hand for palpation of the pulse, a necessaryadjunct to the auditory method. A furtheradvantage is that the phonendoscope can beefficiently used for auscultation of the heart;when thus employed it should be applied to thechest, under the gentlest pressure—the ebonitedisc attached to the rubber cover merely touching. 1 Messrs. Hawks
Studies in blood-pressure : physiological and clinical . ndoscope over theend-piece of a stethoscope are: (1) increasedsensitiveness; (2) avoidance of pressure, andespecially of variable and uneven pressure overthe artery ; and (3) liberation of the finger of theleft hand for palpation of the pulse, a necessaryadjunct to the auditory method. A furtheradvantage is that the phonendoscope can beefficiently used for auscultation of the heart;when thus employed it should be applied to thechest, under the gentlest pressure—the ebonitedisc attached to the rubber cover merely touching. 1 Messrs. Hawksley will recover it at a nominal cost. APPARATUS 11 V. The Screw-Compressor Many observers have found the screw-compressor(Fig. 4) more satisfactory than the ball or pumpfiller in the It consists of (1) astrong canvas bag adherent to (2) two smallboards (12 x 18 cm.), through which (3) a strongrapid screw passes. When in use, the tap (A) isopened for the admission of air; the wheel (B) isunscrewed to the limit of the screw; tap A is. Fig. 4. then closed, and the wings of the screw are turned,when air is compressed into the air-bag andmanometer, previously connected by the rubbertubes (C and D).2 1 J. A. MacWilliam and G. Spencer Melvin thus refer to it inHeart, vol. v, p. 192: For conveniently graduating the applica-tion of the external pressure, Olivers screw-compressor, whenemployed with a suitable armlet (with a rubber bag of not toolarge capacity), is very useful. 2 The air capacity of the compressor is so adjusted to that ofthe armlet as to secure compression to 300 mm. when the armletis closely adjusted. Should the easy turning of the screw of the 12 STUDIES IN BLOOD-PRESSURE The practical advantages of the compressor are : 1. The avoidance of leakage, and its conse-quence—a falling index—from a defective air-valve, which cannot be rectified without loss oftime and trouble. This not infrequent defect ofthe ball or pump filler, always a source of an
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