. Bulletin. Science. z^^./-?^^'/'r' y^ 'â /.. 29 James Reid, The Telegraph in America, New York, 1879; Robert L. Thompson, Wiring a Continent: The History of the Telegraph Industry in the United States, 1832-1866, Princeton, 1947. Figure 32.âThe Morse-Vail telegraph. Top, original register used in the Baltimore-Wash- ington trials of 1844, now at Cornell University, Ithaca, New York. (Smithsonian photo 29651.) Bottom, original telegraph key used in the mid-1840's, perhaps at the same time as the Washington-Baltimore trials. Alfred Vail's signature is impressed into the wooden base of both inst
. Bulletin. Science. z^^./-?^^'/'r' y^ 'â /.. 29 James Reid, The Telegraph in America, New York, 1879; Robert L. Thompson, Wiring a Continent: The History of the Telegraph Industry in the United States, 1832-1866, Princeton, 1947. Figure 32.âThe Morse-Vail telegraph. Top, original register used in the Baltimore-Wash- ington trials of 1844, now at Cornell University, Ithaca, New York. (Smithsonian photo 29651.) Bottom, original telegraph key used in the mid-1840's, perhaps at the same time as the Washington-Baltimore trials. Alfred Vail's signature is impressed into the wooden base of both instruments. {USNM 181411; Smithsonian photo 2ygyg.) By the end of the 1840's, other telegraph systems in the United States were in competition with Morse's system, for his invention had finally proven to be a profitable one. One of these later systems was an improvement that Bain had worked out on his elec- trochemical telegraph ( patent 6328, April 17, 1849). A more important competitor of the Morse system was the letter-printing telegraph. Vail had made detailed sketches of a printing telegraph as early as 1837 but had never patented it. In April 1846 Royal E. House of Vermont invented a printing telegraph whose transmitter (fig. 36) had a set of keys like those on a piano ( patents 4464, 9505). There was one key for each letter of the alphabet. Each key produced a certain number of electrical im- pulses. At the receiving station these impulses ad- vanced a type wheel until finally the letter that had been signaled by the transmitter was reached and was 300 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Instituti
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