An introduction to physiology . Fig. 70. The sphygmograph. 523 THE OUTGO OF ENERGY hollow tube through which the air waves reach therubber ruerabraue. A right-angled piece of alumin-ium transmits the motion of the membrane to thewriting lever. The moving parts are of the lightest. Fig. 71. The sphygmograrih tambour; about twicethe actual sLse. construction. The axle of the writing lever is held ina yoke, the distance of which from the fulcrum of thelever is readily adjustable. The rubber membrane isnot tied, but is held in place by a removable ring, —a time-saving device. If a small glass this
An introduction to physiology . Fig. 70. The sphygmograph. 523 THE OUTGO OF ENERGY hollow tube through which the air waves reach therubber ruerabraue. A right-angled piece of alumin-ium transmits the motion of the membrane to thewriting lever. The moving parts are of the lightest. Fig. 71. The sphygmograrih tambour; about twicethe actual sLse. construction. The axle of the writing lever is held ina yoke, the distance of which from the fulcrum of thelever is readily adjustable. The rubber membrane isnot tied, but is held in place by a removable ring, —a time-saving device. If a small glass thistle-tube placed over the carotidartery be connected with this tambour by a rubbertube, preferably with a side branch, admirable pulsetracings may be recorded. By covering the thistle-tube with a rubber membrane upon which a bone but-ton is cemented, sphygmograms may be taken fromthe radial artery or from the tubes of the circulationscheme. The same tambour is used with the plethys-mograph tube. THE CIRCULATION OF THE BLOOD 529 Now turn the drum until the point of theaortic lever lies beneath the notch seen in thedown stroke of the pulse curve (the dicroticnotch, see page 546). Describe synchronousordinates. It is known that the dicrotic notchin the aortic pulse curve cor
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