rimeter 12

9. Vertical cross-section of chair calorimeter from front to back 13

10. Photograph of framework of chair calorimeter 14

11. Photograph of portion of framework and copper shell 14

12. Cross-section in detail of walls of calorimeter 16

13. Detail of drop-sight feed-valve and arrangement of outside
cooling circuit 18

14. Schematic diagram of water-circuit for the heat-absorbers of
the calorimeter 22

15. Detail of air-resistance thermometer 28

16. Details of resistance thermometers for water-circuit 30

17. Diagram of wiring of observer's table 32

18. Diagram of rheostat and resistances in series with it 36

19. Diagram of wiring of differential circuit with shunts used
with resistance thermometers for water-circuit 38

20. Diagram of galvanometer coil, used with recording apparatus
for resistance thermometers in water-circuit 40

21. Diagram of wiring of circuits actuating plunger and creeper 41

22. Diagram of wiring of complete 110-volt circuit 41

23. Temperature recorder 42

24. Detailed wiring diagram showing all parts of the recording
apparatus, together with wiring to thermometers 42

25. Section of calorimeter walls and portion of ventilating
air-circuit 43

26. Cross-section of bed calorimeter 46

27. Diagram of ventilation of the respiration calorimeter 57

28. Cross-section of sulphuric acid absorber 59

29. Balance for weighing absorbers 62

30. Diagram of absorber table 66

31. Diagram of oxygen balance and cylinders 68

32. The oxygen cylinder and connections to tension equalizer 70

RESPIRATION CALORIMETERS FOR STUDYING THE RESPIRATORY EXCHANGE AND
ENERGY TRANSFORMATIONS IN MAN.

INTRODUCTION.

The establishment in Boston of an inquiry into the nu