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These notebooks were generated at Edison's winter home in Fort Myers, Florida, which he constructed shortly before his marriage to Mina Miller in February 1886. The books cover the period March-May 1886. One book also contains entries from May 1887. Most of the entries are by Edison. There are some entries by Mina Miller Edison, whose name also appears in these books as a witness. The notes and drawings deal with a wide range of subjects. Many of the entries concern phonoplex and multiple telegraphy, Edison's search for a new force, and his attempts to convert heat directly into electricity. There is also material relating to electric lighting, electric railways, spectroscopy, hearing aids, cotton pickers, artificial silk, and numerous other items. One book contains notes about the layout of the grounds at the Fort Myers home. Courtesy of Thomas Edison National Historical Park.