. The electric telegraph: was it invented by Professor Wheatston e? . Cooke. First Mechanical Telegraph. March, Cooke. SecondMechanicalTelegraph, February, 1837. Cooke. Experiments on theEscapement. August, Third Patent. Jan. -21, 1840. Wlieatstone. ThirdMechanicalTelegi-aph. Autumn of 1839,

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