On This Day in Telephone History September 24TH 1924 - Demonstration by Bell System engineers of submarine cable transmission (telegraph) at speed of 1,900 letters per minute, about four times the speed of older cables. Improvement came from using permalloy loaded cable with electronic apparatus at terminals. The cable used was between New York and Horta, in the Azores.

On This Day in Telephone History September 24TH 1924

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On This Day in Telephone History September 24TH 1924 – Demonstration by Bell System Engineers of submarine cable transmission (telegraph) at speed of 1,900 letters per minute, about four times the speed of older cables. Improvement came from using permalloy loaded cable with electronic apparatus at terminals. The cable used was between New York and Horta, in the Azores.

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