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Paper containing two cyphers, one by Christian Huygens containing an inversion, sent in a letter to the Royal Society on 6 February 1669 and shown to the Society on 21 February 1669. Wren's cypher was communicated the same day and ordered to be sent to Huygens.

Subject: Mathematics

Read to the Royal Society on 4 February 1669 [likely inaccurate given dating surrounding Huygens' cypher].

Reference number
Earliest possible date
Physical description
Ink on paper
Page extent
1 page

Creator names

Christiaan Huygens

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Christopher Wren

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Christiaan Huygens, Christopher Wren, Cyphers, two cyphers by Christian Huygens and Chr [Christpher] Wren, 1669, CLP/3i/46, The Royal Society Archives, London,, accessed on 24 July 2024

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  • Classified Papers

    Dates: 1592-1741

    The 'Classified Papers' of the Royal Society are papers from British and international natural philosophers and scholars categorised according to subject areas.

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