What is the Telegraphic transmission method created in 1830?

Answer 1

In 1825, British inventor William Sturgeon (1783-1850) revealed his invention, the electromagnet; thereby laying the foundations for a large scale evolution in electronic communications. In 1830, an American, Joseph Henry (1797-1878), demonstrated the potential of Sturgeon's electromagnet for long distance communication by sending an electronic current over one mile of wire to activate an electromagnet which caused a bell to strike but it had yet to become a practically and commercially viable system of communication It took two British physicists, William Cooke and Charles Wheatstone, to develop the same principle of electromagnetism to power their Cooke Wheatstone telegraph; patented in 1837. But it was another American, Samuel Morse (1791-1872), who successfully exploited the electromagnet and bettered Joseph Henry's invention, thereby creating a telegraph system that was a practical and commercial success. In 1835 Morse proved that signals could be transmitted by wire and used pulses of current to deflect an electromagnet, which moved a marker to produce written codes on a strip of paper - the invention of Morse Code. The following year, the device was modified to emboss the paper with dots and dashes. He gave a public demonstration in 1838, but it was not until five years later that Congress (reflecting public apathy) funded $30,000 to construct an experimental telegraph line from Washington to Baltimore, a distance of 40 miles. Six years later, members of Congress witnessed the sending and receiving of messages over part of the telegraph line. Before the line had reached Baltimore, the Whig party held its national convention there, and on May 1, 1844, nominated Henry Clay. This news was hand-carried to Annapolis Junction (between Washington and Baltimore) where Morse's partner, Alfred Vail, wired it to the Capitol. This was the first news dispatched by electric telegraph. See http://inventors.about.com/od/tstartinventions/a/telegraph.htm