176 



A RESPIRATION CALORIMETER. 



RESULTS OF ALCOHOL CHECK EXPERIMENT. 



As has been stated, the combustion of known amounts of ethyl alcohol 

 inside the respiration chamber furnishes the means for verifying the 

 accuracy not only of these portions of the apparatus which have to do 

 with the measurement of the respiratory products, but also of the heat- 

 measuring features. Consequently, instead of discussing the check on 

 the heat determinations as a separate section, a summary of the alcohol 

 check experiment in its relation to the determination of water, carbon 

 dioxide, and oxygen as given on pages 102-105 is included in Table 4, 

 with the data on the determination of energy. 



TABLE 4. Summary of Determinations of Water, Carbon Dioxide, Oxygen, and 



Energy. 



Alcohol check experiment, April 6-7, 1905. 



This experiment, a fair sample of a large number of the sort, gives 

 a true test of the apparatus in all its phases. The determinations of 

 energy are as satisfactory as could be expected, averaging 99.8 per cent 

 of the required amount. The summarized results for the determina- 

 tion of water, carbon dioxide, and oxygen show that the apparatus is 

 sufficiently accurate to determine these three factors as well as the 

 energy with an accuracy approaching that of the most approved methods 

 of chemical analysis. 



