Bolton's 'Cypher wheel' for secret correspondence

Made:
1800-1805 in England
maker:
Unknown

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Bolton's 'Cypher wheel' for secret correspondence, a brass disc of four consecutive circles of numerals and the alphabet, the two inner circles are on a separate disc which can be rotated by a knob in the centre (2 5/16" diam.) c. 1802

Details

Category:
Mathematics
Materials:
brass and complete
Identifier:
1954-325
type:
cipher machine
credit:
National Maritime Museum (Gabb Collection)

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