ILLUSTRATIONS. 



Page 



PlG. I. General plan of the respiration calorimeter laboratory 8 



2. The laboratory room. View from southeast corner 10 



3. The laboratory room. View from east side 10 



4. The laboratory room. View from near sink 10 



5. The laboratory room. View from alcove 10 



6. Diagram of the circulation of air through the respiration apparatus. n 



7. Interior of the respiration chamber 12 



8. Horizontal section of respiration calorimeter chamber 15 



9. Rotary blower 16 



10. Mercury valves 21 



1 1 . Water-absorbers 26 



12. A carbon-dioxide absorber 26 



13. Cross-section of carbon-dioxide absorber 28 



14. Vise for tightening carbon-dioxide absorbers 32 



15. An oxygen cylinder with valve, rubber pressure bag, and purifying 



attachments 32 



16. Apparatus for analysis of oxygen and air 32 



17. Pans for equalizing pressure 44 



18. Apparatus for analysis of residual air 44 



19. Apparatus for drawing sample of air for residual analysis 49 



20. Water-pressure system 51 



21. Balance for weighing absorbers and oxygen cylinders 58 



22. Alcohol lamp and connections loo 



23. Vertical cross-section of calorimeter chamber through the end 109 



24. Vertical (side) cross-section of calorimeter chamber no 



25. Rear view of calorimeter chamber no 



26. A thermo-electric element 114 



27. Thermo-electric element mounted on wooden rod 114 



28. Method of installing thermo-electric elements in metal walls 114 



29. Side view of metal chamber rolled out on tracks 116 



30. Front view of metal chamber removed from wooden casing 116 



31 . Details of interior of wooden casing 118 



32. Sectional view of walls of chamber, showing method of installing 



air-pipes, water-pipes, and rod for raising and lowering shields. 124 



33. Interior of respiration calorimeter chamber 124 



34. The water-meter 126 



35. The water-meter. Diagrammatic sections showing front and side 



views 128 



36. Clutch to regulate tension on water-meter 130 



37. Observer's table 136 



38. Electrical connections on observer's table 138 



39. A unit key of the mercury switch 140 



40. The mercury switch, top removed . 140 



41. A general view of mercury switch 140 



42. Under side of mercury switch showing electrical connections 140 



43. Diagram of electrical connections of mercury switch 142 



44. Diagram of simple form of Wheatstone bridge 144 



45. The rectal thermometer 156 



46. Weighing apparatus for objects inside the chamber 159 



47. The bicycle ergometer 164 



48. The electric counter 164 



49. Connections for an electrical check experiment 170 



IX 



