. Essentials of laboratory diagnosis; designed for students and practitioners. unt of the construction of the various are practically all constructed on the same principle. Asteel spring is laid upon the radial artery at the wrist in sucha manner that, while it compresses the artery, it does not ob-literate it. Attached directly to the spring is a long lever, or aseries of small levers, that magnify the movements of the free extremity of the lever presses lightly against a stripof paper whose surface has been blackened by the smoke of burn-ing camphor or turpentin
. Essentials of laboratory diagnosis; designed for students and practitioners. unt of the construction of the various are practically all constructed on the same principle. Asteel spring is laid upon the radial artery at the wrist in sucha manner that, while it compresses the artery, it does not ob-literate it. Attached directly to the spring is a long lever, or aseries of small levers, that magnify the movements of the free extremity of the lever presses lightly against a stripof paper whose surface has been blackened by the smoke of burn-ing camphor or turpentine, the strip of paper passing at auniform speed by means of a clockwork arrangement. Thesimplest and most practical sphygmograph is that of Dudgeon 122 SPHYGMOYLAXOMETRY AXD SPHYGMOGRAPHY. (Fig. 28), which, after a little practice, may be relied upon togive a true and accurate record of the pulse wave. The Polygraph (Fig. 29).—There are many perceptiblemovements due to the circulation that the sphygmograph failsto register, and when it is desired to record these movements. Fig. 28.— Dudgeons Sphtgmogeaph. other instruments have to be used. The method most eommonlyemployed has been to convey, by means of a tubular air system,the movements to be registered, to a recording tambour operatingagainst a suitable recording surface. Two tambours are usuallyemployed, with their levers placed one above the other, so thatsimultaneous records of these different movements, the apex beatand jugular pulse, can be readily reproduced. Jaquets polygraph consists of a metal frame to which isscrewed a cuff for attaching to the wrist. The sphygmographproper is attached to the frame. The window cut out of the SPHYOMOnKAlMlY 123 frame Is fco be applied accurately along the radial artery (pre-viously marked out with a pencil)3 and the cuff then strappedaround the wrist quite tightly. The sphygmograph proper is setinto the frame by hooking into the hinge, and then the connec-tion of the two parts is
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcetc, bookyear191
