110 



SPECIAL PHYSIOLOG Y 



III. TO STUDY THE MOVEMENTS OF THE HUMAN THORAX. 



1. Appliances. Stethograph (see Appendix, 14); chest pantagraph 

 (see Appendix, 15); chronograph and kymograph. 



2. Observations. With the stethograph (Fig. 58). (1) How 

 much may be learned of man's respiratory movements by simple 

 inspection? Make a careful enumeration and record. 



FIG. 58 



The human stethograph : St, stand with heavy base, supporting a thoracic frame constructed' 

 of gas-pipes and clamps ; a and a', horizontal parallel arms, to be adjusted on either side of the 

 thorax ; a', to touch the thoracic wall ; RT, receiving tambour, constructed as described in the 

 Appendix ; the movements of the cork c, which touches the thoracic wall, are transmitted to the 

 recording tambour rt, thence traced on the kymograph K. 



(2) Take a stethogram of the lateral diameter in the nipple 

 plane. 



(3) Take a stethogram of the dorsoventral diameter of the thorax 

 over the middle of the sternum in the nipple plane. Compare. 



(4) Adjust the stethograph and make a record (a stethogram) of 

 the changes of the lateral diameter of the thorax at the ninth rib. 



