. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . of the pulse and the point of maximum pulsation are bothmade so clearly visible, that the subjective errors are min-imized. Special Construction.—The mechanism of this instru-ment is more complicated than of those previously described,and thoroughly original, but the only essential difference is theaddition of a recording device. Fig. 27 shows the whole
. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . of the pulse and the point of maximum pulsation are bothmade so clearly visible, that the subjective errors are min-imized. Special Construction.—The mechanism of this instru-ment is more complicated than of those previously described,and thoroughly original, but the only essential difference is theaddition of a recording device. Fig. 27 shows the whole appa-ratus in perspective. The U-tube manometer connects with a4-way tube, one branch of which leads to the armlet, another(F) to the special stop-cock (C D), which will be describedlater, and through it to the inflator. The vertical branch (toPS) communicates with the interior of a rubber bulb (B), en-closed in a heavy glass bulb (G), hkfe Mareys sphygmoscope,which, under certain conditions, opens freely to the atmospherethrough the tube E. The object of this device is to shield thedelicate tambour from too sudden changes of pressure, which 1 Erlanger, Joseph. Am. Jour, of Physiol., 1904, vol. x, Proceed, of Soc, p. ToAi To ln| Fio. 27.—Erlanokrs sphtqmomanometek. SYSTOLIC AND DIASTOLIC MEASUREMENTS 95 might rupture the diaphragm. The tamhour is connected withthe air enclosed in the glass bulb (G), and inscribes its pulsa-tions by an aluminum lever, as an ample tracing on the re-volving drum. The pinion designated in the figure allows thetambour to be rotated, so that the lever may be brought tobear on the drum, or removed from it. The tracing is madeon smoked paper, instead of black on white, as the figure, onaccount of the technical limitations of a line drawing, repre-sents it. The drum has two speeds, the faster obtained byremoving the fan, and is controlled by a lever, which projectsthrough the slot on the face of the box covering the clock-wor
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
