| 1837 | Cooke and Wheatstone
obtain a patent on telegraph. Morse publicly demonstrates his telegraph. |
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| 1844 | Morse's first
telegraph line between Washington and Baltimore opens in May. |
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| 1865 | Maxwell mathematically
predicts the propagation of electromagnetic waves through space. |
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| 1866 | Uninterrupted
transatlantic communications are established with the successful laying
of the first telegraph cable on 27 July. |
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| 1876 | Alexander Graham
Bell and Elisha Gray independently invent the telephone. Bell awarded
priority. |
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| 1887 | Heinrich Hertz
shows that electromagnetic waves exist. |