108 



355. Von Feey's Sphygmograph. \djust in the same 

 manner as for Ludwig's. See that .ne clockwork runs 

 properly and take tracing on the small drum. 



356. Richardson's Sphygmograph« Adjust the pres- 

 sure of the button upon the artery until a maximum excursion 

 of the marker is obtained. Wind up the clock-work, insert a 

 strip of smoked paper between the guide wheels, and let the 

 paper travel past the recording point as soon as the latter 

 moves regularly. 



357. Teske's Sphygmograph. Apply this instrument to 

 the radial artery so that the amplitude of the pulse is at its 

 greatest. When all is in readiness, set the smoked paper in 

 motion by pressing the lever. Care must be taken not to 

 move the instrument nor the arm of the person while the pulse 

 is being registered. 



This instrument magnifies the^j] movements of the artery 

 fifty times. The clockwork is regulated so that the smoked 

 paper shall pass through in ten seconds. Six times the number 

 of pulsations traced on the paper will give the number per 

 minute. The clockwork will not pass more than two lengths 

 of the paper at the same rate. It is best to wind it up anew 

 after two lengths have passed. 



358. Sphygmometer. (Von Basch). Find the radial 

 artery where it is most superficial and apply two or three 

 fingers along its course. Note that the pulse can be distinctly 

 felt by all three fingers. Compress firmly with the middle 

 finger. What can you detect with the other two fingers ? 

 Compress with the first finger. What results are noted by the 

 other two ? 



Place the ampulla of the sphygmometer upon the artery 

 at the point of most distinct pulsation. Press gradually 

 but steadily until a point is reached on the scale where the 

 needle oscillates at every beat of the pulse. The pressure will 

 then be the same inside and outside the vessel. This measures 

 the blood pressure. The figures on the scale of the apparatus 

 indicate centimeters of mercury. 



Count your pulse for a full minute, in the standing and 

 sitting positions. Also keep a record of the pulse during 

 different periods of the day, e. g., morning, noon and night. 



