CONTENTS. 



Page 



Introduction 1-4 



The respiration calorimeter ... 4-11 



Description of the apparatus in its earlier 



form 5 



Description of laboratory and arrange- 

 ment of apparatus 7 



The respiration apparatus 11-56 



General principle n 



The respiration chamber 12 



Openings in the chamber 13 



Window 13 



Food aperture 14 



Air-pipe openings 14 



Opening for weighing apparatus 16 



Opening for the water-pipes 16 



Rod for adjusting position of shields.. 17 



Electric-cable tube 17 



Piping and valves to the blower 17 



The rotary blower 18 



Mercury valves 20 



Apparatus (or the determination of water.. 23-27 



Collection of drip 23 



Removal of water vapor from the air cur- 

 rent 24 



Description of the water-absorbers 24 



Durability of the water-absorbers 26 



Efficiency of the water-absorbers 26 



Supply of sulphuric acid 27 



Apparatus for the determination of carbon 



dioxide 27-31 



Description of the carbon-dioxide ab- 

 sorbers 27 



Vise for tightening absorbers 28 



Removal of spent soda lime from the 



absorbers 29 



Preparation of soda lime 29 



Efficiency of the carbon-dioxide ab- 

 sorbers 30 



Testing the water and carbon-dioxide ab- 

 sorber system 32 



Maintenance of the supply of oxygen 32 



Analysis of oxygen 34 



Preparation of the reagents 37 



Converting percentage by volume to 



percentage by weight 38 



Computation of percentage of nitro- 

 gen by weight, using factors 38 



The tension equalizers 39 



Calibration of the pans 41 



Possibility of noxious gases in the system.. 42 

 Acid fumes carried over by air cur- 

 rent 42 



Mercury vapor in the air 42 



Proportion of water vapor in the air.. 43 



Page 



The respiration apparatus -Continued. 

 Apparatus for the analysis of the residual 



air 44-56 



Apparatus for absorption of water 45 



Efficiency of absorption 45 



Apparatus for carbon-dioxide absorption.. 46 



Efficiency of absorption 46 



The Elster meter 46 



Calibration of Elster meter 47 



Test for saturation of air passing through 



the Els-ter meter 47 



Apparatus for drawing sample 48 



Apparatus for constant water pressure 50 



Process of taking residual samples 50 



Sampling the air for the determination of 



oxygen 51 



Method of sampling 52 



The analysis of air 53 



Accessory apparatus 56-62 



Balances 56-58 



Analytical 56 



Balances for weighing the carbon- 

 dioxide and water absorbers, oxy- 

 gen cylinders, etc 56 



Weights 58 



The barometer 60 



Observation of temperature 61 



Calculation of results 63-95 



Amount of water absorbed 63 



Amount of carbon dioxide absorbed 65 



Amount of oxygen admitted 65 



Residual analytical data 66 



Data for the rejection of air 67 



Corrections for variations in volume and 



composition of residual air 67-83 



Necessity for residual analyses 67 



Possibility of leakage 68 



Factors used in the calculation of the re- 

 sidual analyses 69 



Volume of air in air-circuit 69 



Volume in chamber 69 



Volume of air in air-pipe from cham- 

 ber, mercury valves, and blower.. 70 



Volume of air in water-absorbers 70 



Volume of air in carbon -dioxide ab- 

 sorbers 70 



Volume of remainder of air system 71 



Volume of objects in the chamber not 



permanent 71 



Vcluiue in an alcohol check experiment 71 



Volume in experiments with man 72 



Fluctuations in the air volume 72 



Volume in the pans 72 



Compression of air in absorbing system. 73 



