Reproduced with permission of the AT&T Corporate Archive: Docs. 877, 908, 1006, 1008, 1021, 1022, 1025, 1031, 1154; illustration on p. 551. Reproduced with permission of the Syndics of Cambridge University: Doc. 1141. Reproduced with permission of the City Archives of Philadelphia, Pennsylvania: Doc. 757. Reproduced with permission of the Royce Miscellaneous Papers, Manuscript Department, The Filson Club, Louisville, Ky.: Docs. 751, 753. From the collections of the Henry Ford Museum and Greenfield Village: Docs. 849, 959, 1083, 1090, 1161; illustrations on pp. 154 (neg. B111600), 188 (neg. 0-17017), 469 (neg. B103571). Reproduced with permission of the Historical Society of Pennsylvania: Docs. 1139, 1145, 1147, 1153, 1158. Reproduced with permission of the Institution of Electrical Engineers, London: Docs. 987, 1017, 1033, 1036, 1043, 1055, 1077, 1082, 1123. Courtesy of the New-York Historical Society: Docs. 741, 746, 748, 752. Reproduced with permission of the Henry Draper and Anna Palmer Draper Papers, Rare Books and Manuscripts Division, The New York Public Library, Astor, Lenox and Tilden Foundations: Docs. 989, 990, 998, 1010.

Courtesy of Edison National Historic Site (all designations are to TAEM reel:frame unless otherwise indicated): illustrations on pp. 116 (8:488), 130 (3:363), 254 (11:191), 509 (14:113), 524 (92:63).Page 712