. 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 . aw-ings, kindly loaned me by Dr. Erlanger. The former, in whichthe whole technique of use centres, is the most ingenious feat-ure of the apparatus. It consists of a brass plug C, fitting ina barrel which is surmounted by a dial D. Fig. 28 shows thisfrom above. The head of the plug (C) carries a pointer (P),the shaft of which terminates at its opposite en
. 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 . aw-ings, kindly loaned me by Dr. Erlanger. The former, in whichthe whole technique of use centres, is the most ingenious feat-ure of the apparatus. It consists of a brass plug C, fitting ina barrel which is surmounted by a dial D. Fig. 28 shows thisfrom above. The head of the plug (C) carries a pointer (P),the shaft of which terminates at its opposite end in a pawl (R).This pawl catches hghtly, with a click, like the triple nose-piece of a microscope, in certain grooves on the dial. Thegrooves mark important positions of the stop-cock, and aredesignated In, Out, 1 and 2. At any intermediate point,no connection exists through the stop-cock, and the manom-eter, tambour, and armlet make a closed circuit, the tambourthen registering the pulsation in the arm, and the manometer 96 THE MODERN SPHYGMOMANOMETERS the absolute height of pressure in the whole system. The mi-nute opening (0) in the tambour, prevents suction on the dia-phragm during slow release of the pressure, but it is too small. Fio. 29.—Diagrammatic section of Erlangers at position IN. Above and below the vertical median section of stop-cock are horizontal sections,the upper at level of tube E, the lower at level of tube F. (From Dr. Erlangeradrawing.) to influence the trace caused by the rapid pressure variationsof the pulse-wave. When the pointer is set at In, as inFig. 28, the stop-cock makes the connection shown in Fig. 29. SYSTOLIC AND DIASTOLIC MEASUREMENTS 97 The manometer, armlet, and pressure space (PS), inside therubber bulb (B), are in circuit, through the tube (F), with theinflator attached to the tube In. The air within the glassbulb (G) which communicates with the tambour, marked T S(tambour space), is open freely to the exter
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
