TY - JOUR T1 - On Magnetic Calms and Earth-Currents. JF - Proceedings of the Royal Society of London (1854-1905) VL - 11 SP - 578 EP - 582 PY - 1860/01/01/ UR - http://dx.doi.org/10.1098/rspl.1860.0125 M3 - doi:10.1098/rspl.1860.0125 AU - Walker, C. ER -