On This Day in Telephone History, May 14TH and 15TH 1921, an Exceptional Aurora Borealis affected telegraph service. Powerful earth currents not only interrupted the direct current, grounded circuits used for Morse telegraphy, but burned out heat coils and charred cable insulation at many places in America and Europe.
On This Day in Telephone History May 17TH 1877
E. T. HOLMES OPENED THE FIRST TELEPHONE EXCHANGE LOCATED AT 342 WASHINGTON ST., BOSTON, MASSACHUSETTS THE INITIAL SWITCHBOARD HAD 5 SUBSCRIBER LINES