TY  - JOUR
T1  - On the Variation in Gradation of a Developed Photographic Image When Impressed by Monochromatic Light of Different Wave-Lengths
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 68
SP  - 300
EP  - 321
PY  - 1901/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1901.0048
M3  - doi:10.1098/rspl.1901.0048
AU  - Abney, W.
ER  -