. A practical treatise on medical diagnosis for students and physicians . ograph occupies a positionvery different from that of the thermometer or of other instruments ofprecision. While it is true that a person can learn to detect nearly all thevariations of the pulse by palpation alone, yet the tracing has the greatadvantage of permanency, and many persons are led to palpate the pulsemore carefully when they see in a sphygmographic tracing a dicrotismor irregularity which had escaped their attention. Directions foe Using Dudgeons Sphygmograph. 1. Wind up,by the button, the clockwork containe
. A practical treatise on medical diagnosis for students and physicians . ograph occupies a positionvery different from that of the thermometer or of other instruments ofprecision. While it is true that a person can learn to detect nearly all thevariations of the pulse by palpation alone, yet the tracing has the greatadvantage of permanency, and many persons are led to palpate the pulsemore carefully when they see in a sphygmographic tracing a dicrotismor irregularity which had escaped their attention. Directions foe Using Dudgeons Sphygmograph. 1. Wind up,by the button, the clockwork contained in the box. The clockwork carriesthe smoked paper under the writing-needle. 422 PHYSICAL DIAGNOSIS OF DISEASES OF THE HEART, ETC. 2. See that the patient is in a comfortable position, and have him holdtoward you either hand with wrist exposed, fingers gently flexed, andmuscles relaxed. 3. Apply the instrument by slipping tlie band over the hand, the freeend of the band being passed through the retaining clamp. The metalbox should be placed toward the elbow. Fig. Dudgeons sphygmograph. 4. Now adjust the instrument by placing the bulging button whichconnects the levers directly over the radial artery at its most accessiblepoint. 5. Keep the instrument accurately in place with the left hand, anddraw the band through the clamp with the right until the writing-needleplays freely with each pulsation of the radial artery, then fasten the bandby screwing up the clamp. 6. Introduce the smoked paper between the rollers and under thewriting-needle. 7. Vary the pressure by means of the thumb-screw, which connectswith an eccentric, until the best apparent amplitude of vibration isobtained. 8. Instruct the patient not to move the fingers or hand, and furthersteady them for him with your own right hand. 9. Start the clockwork by pushing the bar at the top of the clockworkbox. 10. Allow the paper to run through, and then stop the clockwork is so regulated that five inches
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