History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 415
lock, placed at the side of the magnet in the physicalcabinet, by means of the current conducted from the observatory. STEINHEILS TELEGRAPH. This telegraph (Fig. 91) was in operation previous to July,1837, and, according to Professor Morse, had been adopted by the 396 EARLY DISCOVERIES IN… … This is the first telegraph on record in which the earth was em-ployed for half the circuit, — a most useful application of knowl-edge, gained at great labor, and not patented, but published freelyto the world. Steinheils alphabet is one of great beauty and simplicity, and STEINHEILS TELEGRAPH. 397…
Telegraph
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
