Description of the Electro Magnetic Telegraph: Now in Operation Between the Cities of Washington and Baltimore.
Washington, D.C: J. & G. S. Gideon, 1845. First edition. "When in 1843 Congress approved the construction of an experimental telegraph line between Baltimore and Washington, Vail acted as Morse's chief assistant and received Morse's 'What hath God Wrought' message on May 24, 1844 ... [The present pamphlet] containts one..... Read More about Description of the Electro Magnetic Telegraph: Now in Operation Between the Cities of Washington...
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