Code wheels have been around for a long time in the spy world. The first one was invented by Leon Battista Alberti (February 14, 1404 - April 25, 1472), an Italian author, artist, architect, poet, linguist, philosopher and cryptographer.
Alberti had a bit of Nabatean spirit in him. He would visit ancient Roman and Greek sites and sketch the buildings. Many of his own architectural designs borrowed elements from these sites. But the code wheel was all his own. He is considered the father of cryptology, the science of codes.
Code wheels were used in the U.S. during the Revolutionary War and continued up to the First World War.
Memo for the Record:
From the basement of the White House to the snows of Kilimanjaro, the Junior Spies race against time in their first mission to save the president of the United States.