Patent Model - Improvement in Cryptography

Maker and role
Anthony Flamm (French), Patentee
Production date
Aug 17 1875
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Object detail

Leather, metal
1/2 x 16 1/4 x 10 3/4" (1.3 x 41.3 x 27.3cm)
Flamm's patent consists of "an improved system and apparatus by which a secret correspondence, in the shape of letters, postal-cards, telegrams, or otherwise, can be carried out, with the usual letters of the alphabet, rapidly, and yet be unintelligible to all outside parties, by use of a simple and inexpensive apparatus." (Patent Number 166,761)
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