DUDGEON S SPHYGMOGRAPH. 



131 



[(5.) Dudgeon's Sphygmograph. This is a most convenient form of 

 sphygmograph. Fig. 49 shows its actual size. 



Fig. 49, Dudgeon's sphygmograph. 



The instrument after being carefully adjusted upon the radial artery 

 is kept in position by an inelastic strap. The pressure of the spring 

 is regulated by the eccentric wheel to any amount from 1 to 5 ounces. 



Fig. 50. Mode of applying Dudgeon's sphygmograph. 



