Telegraph+(1-5)

The telegraph was created to send messages from human to human through coded electric signals. In 1746 French scientist Jean-Antoine Nollet connected pieces of iron wire to a discharged battery of Leyden jars. He observed that each man received a electrical shock at the same time showing the speed to be high. In 1753 a Scots Magazine put a piece of wire for every letter of the alphabet and a message could be sent by connecting them to a electrostatic machine. In the early 19th century Baron Schilling von Canstatt had a transmitting device that consisted of 16 black and white keyboard keys. They were connected with galvanometers one served for returned current and one for a signal bell. David Alter invented the first known electric telegraph. The first commercialized telegraph was constructed by Sir William Forthergill Cooke and Charles Wheatstone patented it in 1837. The first time it was used was helped to catch a murderer.