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  2. Purple parchment - Wikipedia

    en.wikipedia.org/wiki/Purple_parchment

    Purple parchment. Purple parchment or purple vellum refers to parchment dyed purple; codex purpureus refers to manuscripts written entirely or mostly on such parchment. The lettering may be in gold or silver. Later [when?] the practice was revived for some especially grand illuminated manuscripts produced for the emperors in Carolingian art and ...

  3. Type B Cipher Machine - Wikipedia

    en.wikipedia.org/wiki/Type_B_Cipher_Machine

    Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog in use. In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign ...

  4. Magic (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Magic_(cryptography)

    Magic was set up to combine the US government's cryptologic capabilities in one organization dubbed the Research Bureau. Intelligence officers from the Army and Navy (and later civilian experts and technicians) were all under one roof. Although they worked on a series of codes and cyphers, their most important successes involved RED, BLUE, and ...

  5. Mimeograph - Wikipedia

    en.wikipedia.org/wiki/Mimeograph

    A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph . Mimeographs, along with spirit duplicators and ...

  6. Rossano Gospels - Wikipedia

    en.wikipedia.org/wiki/Rossano_Gospels

    Rossano Gospel's paper are vellum parchment, made from the skin of a calf; the thinner parchment is, the higher its value. The large (300 mm by 250 mm) book has text written in a 215 mm square block with two columns of twenty lines each. The prefatory cycle of illustrations is also on purple dyed parchment. Rossano Codex is fully gilded on ...

  7. Spirit duplicator - Wikipedia

    en.wikipedia.org/wiki/Spirit_duplicator

    A school newspaper published using a ditto machine in 1978. A hand-cranked spirit duplicator from the 1960s. The duplicator uses two-ply "spirit masters", also called "master sheets". The first sheet can be typed, drawn, or written upon. The second sheet is coated with a layer of wax that had been impregnated with one of a variety of colorants.

  8. Vellum - Wikipedia

    en.wikipedia.org/wiki/Vellum

    Vellum. Vellum is prepared animal skin or membrane, typically used as writing material. It is often distinguished from parchment, either by being made from calfskin (rather than the skin of other animals), [1] or simply by being of a higher quality. [2] Vellum is prepared for writing and printing on single pages, scrolls, and codices (books).

  9. Codex Petropolitanus Purpureus - Wikipedia

    en.wikipedia.org/wiki/Codex_Petropolitanus_Purpureus

    The Codex Petropolitanus Purpureus (" Purple Codex of Saint Petersburg "), designated by N or 022 (in the Gregory-Aland numbering of New Testament manuscripts), ε19 (in the von Soden numbering of New Testament manuscripts), is a Greek New Testament codex containing the four Gospels written on parchment. Using the study of comparative writing ...

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