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Sector
also called a "proportional compass" or "military compass" and has one more synonym

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  1. a calculating instrument consisting of two rulers (of equal length) joined by a hinge

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 18, 2008
  2. an instrument consisting of two rulers of equal length which are joined by a hinge

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 18, 2008
  3. A number of scales are inscribed upon the instrument which facilitate various mathematical calculations

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 18, 2008
  4. was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 18, 2008
  5. used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 18, 2008
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