Reproduced with permission of the AT&T Corporate Archive: Docs. 1198, 1261, 1276, 1290, 1295, 1296, 1302. By courtesy of the Trustees of the Boston Public Library: Docs. 1199, 1311, 1599; illustration on p. 158. Courtesy of the Deutsches Museum von Meisterwerken der Naturwissenschaft und Technik, Munich: illustration on p. 371 (inv. 2463). Reproduced with permission of Dun and Bradstreet and the Baker Library: Doc. 1614. Reproduced with permission of the University Library, University of Exeter, and A. J. Meadows: Doc. 1539. Reproduced with permission of the Postal and Telecommunications Museum Foundation, Budapest: Docs. 1196, 1200, 1201, 1202, 1207, 1208, 1268, 1271, 1272, 1317, 1332, 1370, 1477, 1498. From the collections of the Henry Ford Museum and Greenfield Village: Doc. 1241; illustration on p. 643 (ID 188.1175.B). Reproduced with permission of the Historical Society of Pennsylvania: Docs. 1165, 1167, 1168, 1173, 1181, 1184, 1191, 1234, 1238, 1246, 1250, 1256, 1292, 1309, 1314, 1397. From the collection of Charles Hummel: Docs. 1282, 1330, 1416; illustrations on pp. 212, 426. Reproduced with permission of the Institution of Electrical Engineers, London: Docs. 1204, 1212, 1247, 1254, 1258, 1318, 1331, 1346, 1347, 1552. Copyright Musée des Arts et Metiers—CNAM, Paris: illustration on p. 63 (inv. 8920). Published with permission of the Princeton University Library: Docs. 1203, 1206, 1229, 1232, 1242, 1262. Courtesy of Dr. M. H. Pritchard: Docs. 1205, 1249, 1338. Reproduced with permission of the Science Museum/Science & Society Picture Library, London: illustration on p. 257 (pic. 497/59). Courtesy of Special Collections, Stanford University Libraries: Doc. 1243.

Courtesy of Edison National Historic Site (all designations are to TAEM reel:frame unless otherwise indicated): illustrations on pp. 8, 12 (94:139), 21 top (4:156), 21 bottom (90:656), 34 (4:161), 64 (97:613), 134 (neg. 6328, class 10.250/5), 135 (neg. 6935, class 10.250/6), 154(4:191), 173 bottom (11:665), 219 bottom (class 33.000/46), 239 (neg. 6424, class 14.651/2), 243, 252 (neg. 7001, class 14.650/1), 255 top (8:749), 282 (7:753), 395 (7:934), 406 (class 34.000/17), 407 (class 34.100/3), 414 (7:921), 418 left (neg. 6214, class 14.312/4), 418 right (neg. 6204, class 14.314/3), 454 all (96:509), 494 (27:921), 495 (50:451), 509 (7:812), 594 (4:1066), 600 (18:522), 719 (94:63), 755 middle (29:155), 755 bottom (29:680), 768 (33:34), 805 (29:683).Page 898