TY - JOUR T1 - Contributions to Terrestrial Magnetism. No. III JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 132 SP - 9 EP - 41 PY - 1842/01/01/ UR - http://dx.doi.org/10.1098/rstl.1842.0003 M3 - doi:10.1098/rstl.1842.0003 AU - Sabine, E. ER -