TECHNIQUE FOR METABOLISM DURING REST. 



103 



total amount involves a knowledge of the volume of air entering the 

 chamber. 



COLLECTION CHAMBERS AND ABSORPTION APPARATUS. 



The collection chambers and absorption apparatus, as shown in 

 figure 8, are mounted upon a substantial oak table which is provided 

 with a lower shelf. At the extreme right on the shelf is the rotary air- 

 impeller, a, directly connected with an electric motor, t. This dis- 

 charges the air taken from the respiration chamber into a large copper 



Fig. 8. — Side view of collection chambers and absorption apparatus of the group 



respiration chamber. 



Air from the group chamber is delivered into the wind chest A by means of the rotary air-impeller 

 a, driven by the electric motor i. The larger portion of the air is delivered into the open air 

 through a circular opening in B. The remainder passes into the cylindrical copper cans Ci 

 and C2. The air is drawn from Ci through the pipe E by means of the blower Fi driven by 

 the electric motor G. From Fi by means of the tube H the air passes through the sulphuric 

 acid containers Ji and J2, then by the tube K through the 3-way valve Vi, soda-lime con- 

 tainer L, sulphuric-acid container M, valve V2, sodium-bicarbonate container A'', and finally 

 through the meter O into the open air; an exact duplicate arrangement (see figs. 11 and 12) 

 provides for the removal of air from the cylindrical can C2. h and ^2 are openings closed by 

 rubber stoppers. P is a delicate petroleum manometer for indicating the pressure in the 

 cans Ci and C2. ni and n2 are nuts for regulating height of bathing caps on tops of cans Ci 

 and C2. Valves Vi and V2 provide for the deflection of air from Ci into another set of ab- 

 sorbers like L and M. R, hand hole to wind chest A. 



