XXVI. Respiratory movements in man. a. The stetho- 



graph, b. The thoracometer. c. The belt= 



spirograph. d. The stethogoniometer. 



/. Instruments. Besides a kymograph and a chronograph, 



the following: 



Stethograph. An instrument for recording graphically 

 the movements of the chest-walls [Gould]. 



Thoracometer. An instrument for measuring (and 

 recording) the movements of the chest-walls [Gould]. 



Belt-spirograph. An appliance for recording respira- 

 tory changes in thoracic or abdominal girth. 



Stethogoniometer. An instrument for measuring the 

 curvature of the chest [Gould]. 



2. Appliances needed in the adjustment and use of these 

 instruments. Heavy base support; three large clamp 

 holders; iron rod, 8 or 10 mm. in diameter and 50 cm. 

 long; two wooden or iron rods, 1 cm. in diameter and 

 40 c. m. long ; a receiving tambour ; a recording tambour, 

 with support; two medium clamp holders; two uni- 

 versal clamp holders; simple myograph ; 1^ meter 

 fine fish cord; two pulleys. 



3. Preparation. For construction of apparatus see Appen- 

 dix A, 10-13. 



Adjustment of the apparatus. 

 a. The Stethograph. 



Clamp the center of the iron rod to the heavy base 

 support. Clamp the wooden rods to the iron 

 rods so that they will extend out to one side of the 

 iron rod in a horizontal plane. Figure 20 shows the 

 Stethograph ready for use. 



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