. Bulletin. Science. Figure 33.—Morse-Vail 1845 telegraph. From A. Vail, The American Electro Magnetic Telegraph, Philadelphia, 1845, P- '9-. Figure 34.—Morse system relay, key, and register of about 1846 (reproduction made about 30 years later). {USNM iSoo^y; Smithsonian photo ^^668.) PAPER 29: .DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: II 301. 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 Ins
. Bulletin. Science. Figure 33.—Morse-Vail 1845 telegraph. From A. Vail, The American Electro Magnetic Telegraph, Philadelphia, 1845, P- '9-. Figure 34.—Morse system relay, key, and register of about 1846 (reproduction made about 30 years later). {USNM iSoo^y; Smithsonian photo ^^668.) PAPER 29: .DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY: II 301. 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 Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
