Beginning of Essay
1. Introduction Computer and telephone networks inflict a gigantic impact on today's society. From letting you call John in Calgary to letting you make a withdraw at your friendly ATM machine they control the flow of information. But today's complicated and expe ....

Middle of Essay
.... to a battery via a switch. When the switch is down the current flows from the battery through the key, down the wire, and into the sounder at the other end of the line. By itself the telegraph could express only two states, on or off. This limitation was eliminated by the fact that it was the duration of the connection that determined the dot and dash from each other being short and long respectively. From these combinations of dots and dashes the Morse code was formed. The code included all the letters of the English alphabet, all the numbers and several punctuation marks. A variation to the telegraph was a receiving module that Morse had inven ....