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    Coutinho, aircraft sextants, HR1
    From: Wolfgang Hasper
    Date: 2010 Feb 18, 11:19 -0800

    Some of you may be interested in the linked pages
    of "Lehrbuch der Navigation"
    Bremen 1943, volume II
    They show different aircraft sextants and describe
    their use and properties. (in German...)

    Most intersting is the last paragraph on mechanical
    calculation devices for the celestial triangle,
    including HR1.
    It reads:
    "The altitude slide rule manufactured by Dennert & Pape
    has proven useful and was introduced to navy and air
    force."
    Another hint that MHR1 is not likely to mean "marine" HR

    Wolfgang

    Pdf documents, zip compressed are linked ~ 5MB
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