192 



STUDIES IN ADVANCED PHYSIOLOGY. 



placed on the descent a second smaller wave, and in some 

 instances a third. The second wave, however, like a notch 



Fig. 86. LUDWIG'S KYMOGRAPH. 



A, revolving drum to receive tracings; JF?, pendulum of the clockwork to rotate drum ; 

 C, the U-shaped mercury tube ; Z>, where connection is made with the blood vessel to be 

 examined; E, F, the piston raised or lowered by the mercury on which it rests; 6, the 

 recording lever. 



