TY - JOUR T1 - Note on the Relative Chemical Intensities of Direct Sunlight and Diffuse Daylight at Different Altitudes of the Sun JF - Proceedings of the Royal Society of London (1854-1905) VL - 15 SP - 20 EP - 24 PY - 1866/01/01/ UR - http://dx.doi.org/10.1098/rspl.1866.0012 M3 - doi:10.1098/rspl.1866.0012 AU - Roscoe, H. AU - Baxendell, J. ER -