TY  - JOUR
T1  - A Compound Wedge Photometer
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 47
SP  - 15
EP  - 18
PY  - 1889/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1889.0061
M3  - doi:10.1098/rspl.1889.0061
AU  - Spitta, E.
ER  -