Metal 



Ytube 



%" diam 



Soda lime to 

 [absorb carbo n dioxide 



Rubber stopper 



■Wire screen to keep air passage clear of soda lime i 



Bureau of Publications, Teachers College, Columbus University 



HOMEMADE RESPIRATION CALORIMETER 



Energy expenditure of the subject while sitting is measured by the oxygen he con- 

 sumes in a given time. The calorimeter is first filled with oxygen from the cylinder. 

 The subject then starts breathing from the calorimeter. The quantity of gas in the 

 calorimeter is adjusted with the pump so that the rubber cap just touches the gauge 

 wire each time the subject exhales. The number of pumpfuls of air put in to 

 make up for the oxygen used by the subject is recorded. One member of the crew 

 keeps time 



they do not exactly fit any particular individual. However, they do in- 

 dicate pretty closely one's basal needs. Thus a girl of 14 who weighs 

 90 lb and who is lying still and "doing nothing" would have to take in 

 fuel food equivalent to (90 X 17) = 1530 Calories per day just to keep 

 alive. Everything she does above that calls for additional energy — addi- 

 tional food. 



120 



