TY  - JOUR
T1  - On a Periodic Change of the Elements of the Force of Terrestrial Magnetism Discovered
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 20
SP  - 21
EP  - 21
PY  - 1871/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1871.0006
M3  - doi:10.1098/rspl.1871.0006
AU  - Hornstein, P.
ER  -