TY - JOUR T1 - On Some Conclusions Derived from the Observations of the Magnetic Declination at the Observatory of St. Helena JF - Proceedings of the Royal Society of London (1854-1905) VL - 7 SP - 67 EP - 82 PY - 1854/01/01/ UR - http://dx.doi.org/10.1098/rspl.1854.0019 M3 - doi:10.1098/rspl.1854.0019 AU - Sabine, E. ER -