TY - JOUR T1 - The 27-Day Period in Magnetic Phenomena JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 90 IS - 622 SP - 583 EP - 599 PY - 1914/09/07/ UR - http://dx.doi.org/10.1098/rspa.1914.0091 M3 - doi:10.1098/rspa.1914.0091 AU - Chree, C. ER -