Essentials of laboratory diagnosis; designed for students and practitioners (1915) (14766625645)

Identifier: essentialsofla00fau (find matches)
Title: Essentials of laboratory diagnosis; designed for students and practitioners
Year: 1915 (1910s)
Authors: Faught, Francis Ashley, 1881-
Subjects: Diagnosis
Publisher: Philadelphia, F. A. Davis company (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress



Text Appearing Before Image:
ze Pocket Indicator. 3. The aneroid sphygmomanometer represents the acme ofpressure-measuring instruments yet made. This instrument isat once small, compact, reliable, and accurate, and, whenproperly used, almost indestructible. The principle is that of the aneroid barometer except thatin the sphygmomanometer of this type the fixed pressure withinthe chambers (see Fig. 25) is the atmospheric pressure (insteadof a vacuum, as in the barometer), while the variable pressure isthat produced within the apparatus by means of the pump andwhich can be changed at the will of the operator. As character-istic of this type of instrument, the Faught aneroid may bedescribed as follows:— SIM1YCMOM ANOMKTKY. 107 The Faught Pocket Sphygmomanometer.—This instru-ment consists of a gold-plated aneroid gauge with a white-enameled dial, each spare of which represents 2 millimeters andwill give readings from zero up to 300 millimeters. This to-gether with the flexible arm-band and metal pump constitute a
Text Appearing After Image:
Fig. 2o.—Enlarged Diagram Showing the Principle and the WorkingParts of the Authors Pocket Indicator. very simple and practical sphygmomanometer, which, with itscarrying case, can fit very easily in the coat-pocket. This in-strument fulfills all the demands of the blood-pressure test,giving accurately both the systolic and diastolic readings, fromwhich can be computed the pulse-pressure and the mean. Ithas been in practical operation sufficiently long to prove notonly that it is accurate, but that it maintains its accuracy, 108 SPHYGMCLMAXCQIETRY AND SPHYGMOGRAPHY. making it unnecessary to repeatedly compare the scale with thestandard mercury column. The rubber portion of the arm-bandmeasures 5 x 9 inches, and so conforms with the requirements ofthe best authorities. The apparatus can be applied and removedin a very short time, and complete observations can be made inless than two minutes. It is not affected by temperature oratmosphere, since when the apparatus is at rest the pressu