The Magnetic Storm of May 14, 1878

Abstract

I WAS much interested in Mr. Perry's note inserted in NATURE, vol. xviii. p. 617, showing the simultaneity of the magnetic storm of May 14, 1878, in different parts of the earth's surface. As these magnetic disturbances are always accompanied by electric disturbances (earth currents) in telegraph wires, I was anxious to find out what effects were observed upon our wires in England on the same day, viz., May 14. I append an extract from the diary of the Relay Station at Haverfordwest, a very important station on the wires running from London to Valentia, and where very careful observations are made of all interferences with the regularity of the working of the wires:—