78 



PROBLEMS IN PHOTOSYNTHESIS 



'lf= 2.8 



12 3 4 



Duration of illumination in hours 



Fig. 31. Oxygen evolution under constant illumination for 5 hours with green measured light 

 and additional blue-green light (Warburg et al., Angew. Chem.). 



7«.= 3 59 



12 3 4 



Duration of illumination in hours 



Fig. 32. Oxygen evolution under constant illumination for 6 hours with green measured light 

 and additional blue-green light (Warburg et al.. Angew. Chem.). 



X L, 



D- 



^ 



X Lj 



M' 



zi C 

 -D 



Fig. 33. Layout of the optical equipment for the produc- 

 tion of two red and two blue-green light beams which are 

 measured separately by means of the bolometer. Continuous 

 line: red light. Dotted line: blue-green light. Li: 500 

 watt projection lamp. L-i: 300 watt xenon high pressure 

 lamp. M: mirrors. M'- semi-transparent mirror. D: 

 diaphragm. C: cuvette (Warburg et al., Zschr. Naturf.). 



to bolometer or 

 manometer vessels 



