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Offered for sale is a fascinating collection of three original vintage Bell System technical engineering manuals published by the American Telephone and Telegraph Company (AT&T), titled “The Application of Electricity and Magnetism to Transmission in the Telephone Plant.”
Originally copyrighted in 1923, these manuals were produced as technical reference and instructional materials covering the electrical principles and technology used in early telephone communication systems.
Included are all three sections:
Section I – Elementary Principles: Direct Currents
* Original copyright 1923
* Revised 1942
* Covers fundamental electrical principles, direct-current circuits, resistance, and electromagnetism.
Section II – Elementary Principles: Alternating Currents
* Original copyright 1923
* Reprinted 1940
* Covers alternating-current electrical theory and its applications in telephone transmission systems.
Section III – Specific Applications: Telephone Repeaters
* Original copyright 1923
* Revised 1927
* Reprinted 1930
* Focuses on telephone repeaters and the technology used to strengthen electrical signals for long-distance telephone communication.
These publications offer a fascinating look into the engineering and scientific principles behind America’s early telecommunications infrastructure, long before modern digital telephone networks.
Of particular historical interest is the section devoted to telephone repeaters, an important technology in the development of long-distance telephone service.
All three manuals feature the original Bell System insignia on their covers.
Condition: Vintage preowned condition with age-related toning, discoloration, cover wear, minor spotting, and some handwritten markings. Interior pages appear generally well preserved in the areas photographed. Please carefully review all photographs for exact condition.
Sold together as a three-volume collection.
An excellent addition to a collection of early telecommunications history, Bell System memorabilia, AT&T publications, vintage electrical engineering literature, or antique telephone equipment.
Original period publications, not modern reproductions.
