230 



VARIOUS FORMS OF STETHOGRAPHS. 



Fig. 102. 

 Marey's Stethograph. 



B 



Fig. 103. 



A, Brondgeest's tambour for registering the respiratory movements &, c, inner 

 and outer caoutchouc membranes; a, the capsule; c?, d, cords for fastening 

 the instrument to the chest; S, tube to the recording tambour; B, normal 

 respiratory curve obtained on a vibrating plate (each vibration = 01 61 3 sec.). 



