Masters of Space

A

Ampere's telegraph, 42.

Anglo-American Telegraph Co., 134.

Ardois signal system, 30.

Atlantic cable projected, 109;
  attempted, 117, 121, 123, 133;
  completed, 124, 136.

Audion amplifier, 256.

Automatic telegraphy, 53, 105, 266.

B

Baltimore-Washington Telegraph Line, 86.

Bell, Alexander Graham, parentage, 140;
  youth, 141;
  teaches elocution, 146;
  experiments with speech, 151, 161;
  meets Henry, 158;
  invents telephone, 162;
  at Centennial Exposition, 165;
  demonstrates telephone, 170;
  Bell Telephone Association, 178;
  Bell-Western Union Settlement;
  Bell and wireless telegraphy, 189;
  Transcontinental telephone, 248.

Bethell, Union N., 241.

Blake, Clarence J., 154.

Blake, Francis, invents telephone transmitter, 182.

Branly coherer, 204.

Brett, J.W., 112.

Bright, Charles Tiltson, 112, 120, 125, 128.