est in electricity, ~1~, 18
invention of pump, 21
early longing for telegraph, 41
studies with Silliman, 236
machine for carving marble, 245, 247
and Dana's lectures on electricity (1827), discussions with Dana, 290
familiarity with electrical science, 29
thoughts (1821-31) connected with future invention of telegraph, 236,
324, 335, 394, 395, 402
first conception of idea of telegraph (1831), 417-421, ~2~, 8
experiments with photography, ~1~, 421, ~2~, 129
divisions of life, trials of scientific life, ~1~, 434, ~2~, 1, 2, 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