132 



BRONDGEEST'S PANSPHYGMOGRAPH. 



As in other instruments, the tracing paper is moved in front of the 

 writing-needle by means of clock-work. The writing-levers are so 

 adjusted that the movements of the artery are magnified fifty times.] 



[Fig. 51 is a sphygmogram taken 

 with this instrument from a 

 healthy individual. It represents 

 a perfect tracing a. the vertical 

 upward, systolic or percussion 

 wave ; b, apex ; c, on the 

 descent ; d, first tidal or pre- 

 dicrotic wave; e, aortic notch ; 

 Fig. 51. Sphygmogram pressure 2 oz. /, dicrotic wave (Dudgeon).] 



(6.) Marey's Tambours are also employed for registering the move- 

 ments of the pulse. They are used in the same way as the pansphygmograph 

 of Brondgeest. Fig. 52 shows their arrangement. Two pairs of metallic 

 cups (S, S and S', S', Upham's capsules) are pierced in the middle by 



Z' 



Fig. 52. 



Scheme of Brondgeest's sphygmograph, on the principle of Upham and Marey's 

 tambours S, S' , receiving and recording (S, S') tambours with writing -levers, 

 Z and Z'; K, K', conducting tubes : p over heart, p' over a distant artery. 

 This illustration also shows the principle of Marey's cardiograph. 



thin metal tubes, whose free-ends are connected with caoutchouc tubes, 

 K and K'. All the four metallic vessels are covered with an elastic 

 membrane. On S and S' are fixed two knob-like pads, p and p', 

 which are applied to the pulsating arteries, and the metal arcs, B and 



