CH. XXIV.] 



MECHANISM OF RESPIRATION. 



351 



Fig. 320. Stethograph. h, tambour fixed at right angles to plate of steel / ; 

 c and d, arms oy which instrument is attached to chest by belt . When the 

 chest expands, the arms are pulled asunder, which bends the steel plate, and 

 the tambour is affected by the pressure of 6, which is attached to it on the one 

 hand, and to the upright in connection with horizontal screw g. (Modified 

 from Marey's instrument.) 



Tambour. 

 Ivory button. 



Tube to commu- 

 nicate with re- 

 cording tam- 

 bour. 



Ball to fill appa- 

 ratus with iiir 



Fig. 32i.-Stcthograph. (Bunion-Sanderson.) 



