Use this machine to write in secret code. When you press a letter key, the dial will turn so that the arrow at the top points to that letter. The arrow on the inside will turn to point at the coded letter. If you send someone a message encoded this way, they can type the coded message in, and the original message will come out. Try typing this encoded message in and see what comes out: RXBR PZF VIWH VIJTFP VCNMDWXI Use the green flag button to reset the machine.
The science of secret communication is called 'cryptography'. You can learn a lot about it here: http://en.wikipedia.org/wiki/Cryptography This is a revised version of my earlier code machine. The encoding/decoding function is the same, but there is better motion and sound.
