History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 130
dle as nu-merous as we desire, and which rapidly succeed each other, eitherto the right or to the left, and the direction of which deviationsis carefully made to coincide with that of the motion impartedby the hand to the arm with which the handle is furnished, bywhich the commutator is made to… … to its highest perfection, — which works at the astonishing rate ofsixty or seventy strokes or breaks in a second, and at once 112 ELECTRIC TELEGRAPH APPARATUS. records the information by its own machinery in plain Romanletters, and literally gives letters to lightning, as well as light-ning to…
Telegraph
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