THE CALORIMETER. 



11 



THE CALORIMETER CHAMBER. 



The respiration chamber used in Middletown, Connecticut, was designed 

 to permit of the greatest latitude in the nature of the experiments to be 

 made with it. As a result, it was found at the end of a number of years of 

 experimenting that this particular size of chamber was somewhat too small 



Fig. 7. — Horizontal cross-section of chair calorimeter, showing cross-section of 

 copper waU at A, zinc waU at B, hair-felt at E, and asbestos outer waU 

 at F; also cross-section of all upright channels in the steel construction. 

 At the right is the location of the ingoing and outgoing water and the 

 thermometers. At C is shown the food aperture, and D is a gasket sepa- 

 rating the two parts. The ingoing and outeoming air-pipes are shown at 

 the right inside the copper wall. The telephone is shown at the left, and 

 in the center of the drawing is the chair with its foot-rest, G. In dotted 

 line is shown the opening where the man enters. 



for the most satisfactory experiments during muscular work and, on the 

 other hand, somewhat too large for the best results during so-called rest 

 experiments. In the earlier experiments, where no attempt was made to 

 determine the consumption of oxygen, these disadvantages were not so 

 apparent, as carbon dioxide could be determined with very great accuracy; 



