. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. HLOOD PRESSURE. 243 The other features consist of secondary oscillations, which vary according to the tension of the arterial wall and the inertia of the instrument. A hard pidse shows many of these, owing to the quick elastic reactions which accompany the greater state of tension. A soft pulse, on the other hand, shows less height of curves, less acuteness in the angles, and a less number of secondary oscillations. Blood Pressure. Estimate this by means of the sphyg- mo
. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. HLOOD PRESSURE. 243 The other features consist of secondary oscillations, which vary according to the tension of the arterial wall and the inertia of the instrument. A hard pidse shows many of these, owing to the quick elastic reactions which accompany the greater state of tension. A soft pulse, on the other hand, shows less height of curves, less acuteness in the angles, and a less number of secondary oscillations. Blood Pressure. Estimate this by means of the sphyg- mometer (Hill & Barnard). See that the column of fluid stands at zero. To adjust this, hold the instrument vertically, open the tap at the top, and press the rubber ampulla gently upon the surface of a table, supporting it with both hands to control your movement, and closing the tap the moment the fluid stands at zero. (a) Artery. Press the ampulla upon the radial until the maximum pul- sation of the column of fluid is obtained. The pressure will then be the same inside and outside the vessel, , in the sphygmometer, and its Fig. 48. Bill A: Barnard's Sphygmometer, magnitude is read off on the stem, which is graduated in terms of millimetres of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Birch, De Burgh. Philadelphia : P. Blakiston's Son
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