These ledger sheets summarize Edison's personal finances in several categories. There are four sets of sheets with the titles "General Ledger," "I[nvestments?] & C[redits?]," "L[aboratory?] & M," and "Investments Ledger." Although the accounts themselves are undated, the dates "Jany 1904," "Jany 1906," and "Jan 1907" are inscribed by Edison in the margin on one of the sheets. Many of the other entries are also annotated by Edison. Included are entries pertaining to Edison's investments in the bonds of the Lake Shore & Michigan Southern Railroad, New York Central Railroad, Union Pacific Railroad, and several other railroads, as well as in the stocks and bonds of his own companies. Also included are entries relating to the cost of various experiments with project numbers that correspond to those in Project Number Notebooks N-01-03-15 and N-02-01-17 (Thomas A. Edison Papers: A Selective Microfilm Edition, Part IV (1899-1910), reel 180). Most of the experiments date from 1907, although there is one from December 1903.
All of the documents have been selected. Courtesy of Thomas Edison National Historical Park.