The electric telegraph: was it invented by Professor Wheatston e? (1856)
Cooke, William Fothergill, 1806-1879 · London, Sold by W. H. Smith and Son · leaf 237
ooke. Jan. 21, 1840. Part L. Prof. Wheatstones Escapement Telegraph, with two wires. Part M. Mr. Cookes Escapement Telegraph, with three wires. Portable Telegrapli, without Battery. N.B.—The Diagrams in tliis Drawing are intended only to illustrate the principles on which the different instruments…
Wheatstone, Charles, Sir, 1802-1875 · Telegraph
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