Morse Code

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Morse code uses a sequence of short and long elements to represent a message. The short and long elements can be formed by sounds, marks, or flashes with a flashlight and are commonly known as "dots" and "dashes" or "dits" and "dahs".

It was originally created for Samuel Morse's electric telegraph in the early 1840s, and Morse code was also extensively used for early radio communication beginning in the 1890s. For the first half of the twentieth century, the majority of high-speed international communication was conducted in Morse code, using telegraph lines, undersea cables, and radio circuits.

The most popular current use of Morse code is by amateur radio operators. Pilots and air traffic controllers are usually familiar with Morse code and need to have a basic understanding.

The book Swallows and Amazons, which you can get on DVD, has a group of children going camping on an island and using Morse code and also semaphore, to communicate with each other.