This folder contains correspondence relating to the technical and commercial development of the telegraph. Most of the letters are from the law firm of Eaton & Lewis and concern the case of Welch v. Edison. There is also a letter about quadruplex patent royalties.

Approximately 60 percent of the documents have been selected. The following categories of documents have not been selected: routine correspondence regarding the Welch case; a list of Western Union officials; unsolicited correspondence about the Writing Telegraph Co.