PLATE XCIII 



Chamber with part of outer covering removed 



A, Double metal wall chamber. B, Heat-insulating outer cover. C, Window to 

 chamber. D, Outlet providing passage for pipes, wires, etc., through the walls of 

 the chamber. The exterior ends of the resistance thermometers for ingoing and out- 

 going water are seen projecting from the outlet. E, Removable top of chamber. 

 F, Device for heating the air entering the respiration chamber. G, Small pipe car- 

 rying water for cooling the outer metal wall of the chamber. H, Electric-resistance 

 wire carrying current for heating the outer wall. 



