Hi, I have been reading [1] regarding the beginning of the modern martial traditions and methods. In chapter 2, 'Tactical and Strategic Reorganization', in which the birth of the Signal Corp under Myer (by order of McClellan) and the ensuing conflicts with Military Telegraph under Stager are discussed. On pp. 43 - 44 there is a discussion on some processes that Myer implimented including a 'cipher disk' whereby the Union was able to change their telegraph codes on an hourly schedule. It was apparently very effictive in dealing with taps and such. Anyone know of another source that discusses this disk? I looked in Applied Crypto as well as several other books including a Dover reprint of a book from the 30's w/o success. I would in particular like to see a photo or other diagram of its operation. Thanks for any help you can provide. ____________________________________________________________________ | | | Those who make peaceful revolution impossible will make | | violent revolution inevitable. | | | | John F. Kennedy | | | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage@ssz.com | | 512-451-7087 | |____________________________________________________________________| [1] The American Civil War and the Origins of Modern Warfare: Ideas, Organization, and Field Command Edward Hagerman ISBN 0-253-30546-2