On This Day in Telephone History June 19TH 1900 Prof. Michael I. Pupin, of Columbia University, patented a method for using the loading coil to carry talk over greater distances. Pupin and Dr. G. A. Campbell, of the Bell System, working independently, each had proved that loading coils placed at regular and frequent intervals in a telephone Circuit, particularly a circuit in a cable, would improve its transmission efficiency. Pupin's patent application was found to antedate Campbell's by only a month. His patent was purchased by the Bell System, and his and Campbell's discoveries were put to use as rapidly as possible.

On This Day in Telephone History June 19TH 1900

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On This Day in Telephone History June 19TH 1900 Prof. Michael I. Pupin, of Columbia University, patented a method for using the loading coil to carry talk over greater distances.

Pupin and Dr. G. A. Campbell, of the Bell System, working independently, each had proved that loading coils placed at regular and frequent intervals in a telephone Circuit, particularly a circuit in a cable, would improve its transmission efficiency. Pupin’s patent application was found to antedate Campbell’s by only a month. His patent was purchased by the Bell System, and his and Campbell’s discoveries were put to use as rapidly as possible.