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  2. Promptuary - Wikipedia

    en.wikipedia.org/wiki/Promptuary

    The units digit of this addition, 1, is written down as the next digit of the multiplication result. The tens digit, which is 1, is carried into the next band. The third band from the right has five digits, 2, 4, 3, 1 and 6 plus the carried 1. These are all added to produce 17. The units digit of this, 7, is written as the next digit of the result.

  3. Napier's bones - Wikipedia

    en.wikipedia.org/wiki/Napier's_bones

    If square rods are used, the 40 multiplication tables can be inscribed on 10 rods. Napier gave details of a scheme for arranging the tables so that no rod has two copies of the same table, enabling every possible four-digit number to be represented by 4 of the 10 rods.

  4. Genaille–Lucas rulers - Wikipedia

    en.wikipedia.org/wiki/Genaille–Lucas_rulers

    Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones . By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations .

  5. Maritime identification digits - Wikipedia

    en.wikipedia.org/wiki/Maritime_identification_digits

    Note that not all countries have MIDs; those without are typically landlocked, with no access to international waters. Sorting MID assignments in numerical order reveals a regional structure, with the first digit: 2 assigned to Europe, 3 to North America and the Caribbean, 4 to Asia (except the southeast),

  6. Fortunate Isles - Wikipedia

    en.wikipedia.org/wiki/Fortunate_Isles

    The Fortunate Isles or Isles of the Blessed [1] [2] (Ancient Greek: μακάρων νῆσοι, makarōn nēsoi) [3] were semi-legendary islands in the Atlantic Ocean, variously treated as a simple geographical location and as a winterless earthly paradise inhabited by the heroes of Greek mythology.

  7. Cassiterides - Wikipedia

    en.wikipedia.org/wiki/Cassiterides

    Herodotus (430 BC) had only vaguely heard of the Cassiterides, "from which we are said to have our tin", but did not discount the islands as legendary. [2] Later writers—Posidonius, Diodorus Siculus, [3] Strabo [4] and others—call them smallish islands off ("some way off," Strabo says) the northwest coast of the Iberian Peninsula, which contained tin mines or, according to Strabo, tin and ...

  8. Ictis - Wikipedia

    en.wikipedia.org/wiki/Ictis

    William Camden, the Elizabethan historian, took the view that the name "Ictis" was so similar to "Vectis", the Latin name for the Isle of Wight, that the two were probably the same island. The Cornish antiquary William Borlase (1696–1772) suggested that Ictis must have been near the coast of Cornwall and could have been a general name for a ...

  9. Chryse and Argyre - Wikipedia

    en.wikipedia.org/wiki/Chryse_and_Argyre

    Some five or six centuries later, in section XIV.vi.11 of his encyclopedic Etymologies, Isidore of Seville (c. 560–636) repeated much the same information: "Chryse and Argyre are islands situated in the Indian Ocean, so rich in metal that many people maintain these islands have a surface of gold and silver; whence their names are derived."

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