77,
      78
    Jackson’s conversations on electrical progress on board ship (1832),
      his later claim to invention, 5, 11, 58, 59, 78, 79, 121, 122, 137,
      274, 305
    basis of telegraph worked out on voyage, dot-and-dash code, sketches,
      6-9, 11, 18
    simplicity of invention, 9, 16, 18, 109, 435
    thoughts on priority, 9, 10
    testimony of fellow passengers, 11, 12, 14
    date of invention, 12, 13
    scientific knowledge necessary for invention, 14-16
    necessary combination of personal qualities and conditions, 16, 57,
      91, 152, 171
    testimony of brothers on talk upon landing, 17, 18
    insistence on single circuit, 18, 102
    bars to progress, lack of funds and essentials, 18, 19
    first steps toward apparatus, saw-tooth type, 21
    cares (1833), forced to put invention aside, 25
    and death of Lafayette, 34
    workshop in University building, resumes experiments (1836), 38, 48
    first instruments, 38-41
    electro-chemical experiments, 41
    discovery of relay, 41, 42, 141
    shuns publicity of invention, poverty, 42
    in Hall of Fame, 44
    first exhibitions of telegraph (1835-38), 45-48, 54, 73-76, 80, 473
    confidence of universal use, belief in aid to humanity, 48, 78, 125,
      153, 179, 314, 345, 435, 460, 488, 490
    fears forestalling and rival claims, 49, 50, 53, 126, 127, 150, 166
    difference in principle of foreign inventions, 50, 90, 92, 93,
      100-102, 240, 250
    writes it “Telegraph”, 50
    originality of invention, share of others in it, 50-53, 61, 470, 472,
      488, 500, 501, 510, 519
    Gale’s and Henry’s connections, batteries, intensifying magnet, 54-59,
      141, 477-479
    public and congressional suspicion, 57, 60, 72, 77, 81, 88, 91, 164,
      189, 193
    acknowledgment of indebtedness, 58, 71, 263, 471, 489
    Vail’s association, contract, 59, 60, 70
    reversion to first plan for receiver, 61
    number code, dictionary, 62
    paternity of alphabet code, 62-68
    patent in America, 69, 89, 157
    continuation of experiments, improvements, 70, 74, 76, 154, 182
    cumbersome instruments, 73
    alphabet supersedes number code, 74-76
    portrule, 74, 88, 90
    “Attention, the Universe” message, 75
    friction with Vail, 79, 80
    exhibition at Washington (1838), no grant results, 81, 103, 135, 137
    connection of F.O.J.  Smith, cause of his later antagonism, 82, 83
    arrangement of partnership with Gale, Vail, and Smith, 83
    desire and plan for government control, 84-86, 119, 175, 176, 228,
      229, 232, 446
    no share in later stock-watering, 86
    Smith’s report to Congress, 87
    expects disappointments, 88, 102, 106
    European trip (1838), 89
    rivals in Europe, 91, 109
    application for British patent,