264 



TABLES 310-311. 



PHOTOGRAPHIC DATA- 



TABLE 310. Photographic Efficiencies of Various Lights. 



TABLE 311. Relative Intensification of Various Intensifies. 



See Nietz and Huse, J. Franklin Inst. March 3 1918. 

 ' B. J. Almanac, see annual Almanac of British Journal of Photography 

 t B. J. refers to British Journal of Photography. 



SMITHSONIAN TABLES. 



