`Polygraphic papers' coder/de-coder by D'Montfort.

Mathematics

Siemens and Halske T52e Cipher Machine, 1940s

Mathematics

1940-1950

Kryha ciphering machine, standard model, introduce

Mathematics

1926-1930

Ciphering calculator in brass inscribed RSWX

Mathematics

Sir Percy Scott's cypher machine

Mathematics

1890-1920

Ideal Codigraph enciphering machine, invented by C

Mathematics

1909-1910

Cipher machine composed of two discs geared togeth

Mathematics

1890-1910

Prototype model of coding and decoding machine, pa

Mathematics