230 



VARIOUS FORMS OF STETIIOGRAPHS. 



Fig. 102. 

 Marey's Stethograph. 



B 



Fig. 103. 



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

 and outer caoutchouc membranes; a, the capsule; d, 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 = O'OIGIS sec.). 



