TY - JOUR T1 - On the Diurnal Deviations of the Horizontal Needle When under the Influence of Magnets JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 113 SP - 342 EP - 392 PY - 1823/01/01/ UR - http://dx.doi.org/10.1098/rstl.1823.0026 M3 - doi:10.1098/rstl.1823.0026 AU - Christie, S. ER -