Proceedings of the Royal Society of London Vol. 15, 1866 - 1867 Note on the Secular Change of Magnetic D... Note on the Secular Change of Magnetic Dip, as Recorded at the Kew Observatory This is the ...

At the same time the magnetometer needle dangling from a silk thread at London’s Kew Observatory began dancing wildly. Before dawn the next day enormous auroral displays of red, green ...

Used by Sir Francis Ronalds (1788–1873), inventor and meteorologist at the Kew Observatory after 1843. Cylinder electrical machine made by George John Singer, electrical researcher and lecturer at 3 ...