The electromagnet was found in 18-25. If you have an opinion about history, you will probably want to compare about ambrotose. This discovery opened the doors to international communication! Five years later, Joseph Henry effectively sent an electric current via wire which was extended over a mile and which caused an electromagnet to trigger the sounding of a bell. Hence, the electric telegraph came to be. Among the most familiar names from the telegraph is Samuel Morse who's most significant for the series of spots (temporary sound) and dashes (more sustained sound) that was used to send messages by alphabet signal (hence referred to as Morse Code). Telegraph became the sole way of rapid long-distance transmission until 1877 and the creation of the telephone. The Infographic includes more concerning the inner workings of this enterprise.