PHOTOGRAPHY BY ULTRAVIOLET AND INFRARED 



615 



Infrared 

 Periodicals: 



Clark, W.: Seeing the Invisible, Science Monthly, 41, 481-489 (1935). 

 : Photography of the Infra-Red, Am. Ann. Phot., 61, 13-22 (1937). 



Books: 



Helwich, O.: "Die Infrarot-P'otografie," W. Heering-Verlag, Halle (1934). 



IsEBT, G.: " Infrarotphotographie," 2d ed. Photokino-Verlag, Berlin (1934). 



Rawling, S. O.: "Infra-red Photography," 2d ed. Blackie & Son, Ltd., (1935). 



Beck, H.: " Photographie des Unsichtbaren," Photokino-Verlag, Berlin (1936). 



Helwich, O.: "Practical Infra-red Photography" (translated from the German b.\- .J. L. Baring), 



British Periodicals, Ltd. (1936). 

 "Photographic Plates for Use in Spectroscopy and Astronomy," 3d ed. Eastman Kodak Go. (1937). 

 "Infra-red Photography with Kodak materials," p. 5, Eastman Kodak Co. (1937). 

 Morgan, W. D., and H. M. Lester: "Leica Manual," 3d ed., Morgan and Lester (1938). 

 CliARK, W.: "Photography by Infrared. Its Principles and Applications," Chapman (19.39). 



