Union Army Cipher Disk | Accurate Civil War Replica physics teach school Penny Drop II has been

Penny Drop II has been featured in holiday toy gift guides by WCVB Boston and MyNBC5 Vermont (Hearst broadcast affiliates)

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Thank you to The Rest is Science YouTube channel for featuring our magic trick on

crafted with precision and designed to challenge your mind

it measures about 7 inches square

Union Army Cipher Disk | Accurate Civil War Replica physics teach school Penny Drop II has beenA precision laser engraved wood version of this famous cipher which was used for the encryption of messages of the Union Army during the American Civil War (1861 1865). It was a system primarily used for flag signals where there was a line of sight or for encrypted morse code messages. Note each disk has a unique serial number as was used in the original wheels. Instructions for use are included. The letters A. J. M on the disk are for Albert J Myer,