WILLATS'S 

 SCIENTIFIC MANUALS, No. I. 



PLAIN DIRECTIONS 



FOR OBTAINING 



PHOTOGRAPHIC PICTURES 



BY THE 



CALOTYPE, ENERGIATYPE, 



AND 



OTHER PROCESSES ON PAPER; 



INCLUDING THE 



CHRYSOTYPE, CYANOTYPE, CHROMOTYPE, 



ETC., ETC. 

 WITH ALL THE LATEST IMPROVEMENTS. 



BI3UOTHEQUE 



BV ,* 



LONDON: 

 T. & R. WILLATS, OPTICIANS, 98, CHEAPSIDE : 



AND 



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