TY  - JOUR
T1  - Contributions to Terrestrial Magnetism.--No. XIII. 
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 20
SP  - 443
EP  - 443
PY  - 1871/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1871.0087
M3  - doi:10.1098/rspl.1871.0087
AU  - Sabine, E.
ER  -