TY - JOUR T1 - On the Power of Masses of Iron to Controul the Attractive Force of a Magnet JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 121 SP - 501 EP - 506 PY - 1831/01/01/ UR - http://dx.doi.org/10.1098/rstl.1831.0030 M3 - doi:10.1098/rstl.1831.0030 AU - Harris, W. ER -