CHAPTER XX 



THE PULSE. ARTERIAL PRESSURE IN MAN 



The pulse in the arteries. Feel the pulse in the radial artery and 

 determine and note (1) its rate, (2) its quality, whether hard or soft, 

 bounding, readily compressible, etc. Apply a sphygmograph, either 



Fin. 70. DIAGRAM OP MAREY'S SPHYGMOGRAPH. xpr, SPRING WITH BUTTON FOR RESTING ON RADIAL 



ABTERY ; c, 0AM, FOR EXERTING PRESSURE ON THE SPRING ; scr, SCREW CONNECTING SPRING 



WITH DOUBLE LEVER ;, V ; gi, SMOKED GLASS OR PAPER FOR WRITING THE PULSE. 



Marey's original pattern (fig. 70) or the modification devised by 

 Dudgeon (fig. 71). Using the cam, exert such pressure upon the 

 spring of the sphygmograph as will allow the variations in pressure 

 within the artery to be most manifest. The tracings are taken on 

 slips of paper smoked over a candle. Write on each slip the name 

 of the subject of the experiment and the pressure which was em- 

 ployed ; varnish and preserve. 



83 



