The telegraph in American and Morse memorial (1886)
Reid, James D · New York, Printed for the author by J. Polhemus · leaf 914
mature, accordingto the method patented by F. L. Pope and T. A Edison, April 26, 1870.By doing this he dispensed with one of the main wires. The current ofa single wire passed through all the magnets. The transmitter sendingrapidly alternate waves of positive and negative polarity vibrated… … 836 American Telegraphic History. r that when a letter was being reached, the last wave of current sent wasprolonged, and the prolongation of the current saturated the pressmagnet and secured the action which impressed the type. An ingenious improvement to increase the working margin betweenthe…
Morse, Samuel Finley Breese, 1791-1872 · Telegraph
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