The window card code
Article Abstract:
The window card code uses a piece of cardboard with small rectangular openings cut into it to decode secret messages written on a sheet of paper. Instructions for using it to code and decode messages are presented.
Publication Name: Boys' Life
Subject: General interest
ISSN: 0006-8608
Year: 1995
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The telephone code
Article Abstract:
Instructions are presented for using the letters and numbers on push-button telephones to write a message in a secret code and to decode a secret message.
Publication Name: Boys' Life
Subject: General interest
ISSN: 0006-8608
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
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