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  • #31
    Originally posted by El Toro View Post

    A bit of cruising on the internet brought me to a US defence forces technical manual for sports facilities that includes a reprint of Bob Sparks 1969 table of imperial to metric conversions. It includes the note:



    I'm not sure if the 1969 tables were ever updated or had errata but using the tables in the manual gives the following conversions (with precise mathematical conversions):
    18-1 = 5.51 (5.5118)
    18-2 = 5.54 (5.5372)
    18-4 = 5.59 (5.5880)

    These provide perfect alignment with the imperial heights measured in 1972 and the metric heights now listed.


    Full reference for the document:

    Planning and Design of Outdoor Sports Facilities
    Departments of the Army, Navy and Airforce.
    October 1975

    (TM 5-803-10/NAVFAC P-457/AFR 88-33)
    Very cool finding. Thanx, El Toro

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