R ESP IRA TWN. 



119 



Let a member of the division remove all clothing 

 above the waist and be the subject of observation for 

 the other members. In making observations with the 

 stethograph the subject should sit with his back or 

 side to the table. The observer may readily adjust 

 the stethograph to record the changes of any lateral 

 or dorso-ventral diameter of the thorax. For all 

 observations upon the respiratory changes in the 

 thorax, the subject should keep the parts of the body 

 symmetrically disposed. 



FIG. 20. 



Observations. 



(1) How much may be learned of man's respiratory 

 movements by simple inspection? Make a careful 

 enumeration and record. 



(2) Adjust the stethograph and make a record a 

 stethogram of the changes of the lateral diameter 

 of the thorax at the ninth rib. 



Does the stethograph show more than could be 

 learned from inspection? If so, what? 



(3) Take a stethogram of the lateral diameter at the 

 sixth rib. How does it differ from the ninth rib 

 stethogram ? Account for the difference. 



