TY  - JOUR
T1  - On the Relation between the Sun's Altitude and the Chemical Intensity of Total Daylight in a Cloudless Sky. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 18
SP  - 301
EP  - 303
PY  - 1869/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1869.0065
M3  - doi:10.1098/rspl.1869.0065
AU  - Roscoe, H.
AU  - Thorpe, T.
ER  -