Next, he explained how a code wheel worked for sending secret messages. He told the kids how it was important to change the code often, to keep the enemy confused. Usually, codes were changed several times a month. In some cases it was changed weekly.
He gave the kids instructions on how to make a code wheel and they began working on their own wheels. Some made their wheels different from the others. They found out this was a problem when trying to translate the code made on a different wheel. Mr. Jack explained to them why it was important that the parties sending and receiving coded messages had the same code wheel configuration.
This was a neat learning experience for the group.
