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    Re: Arg 1 Ww 11 U Boat Navigation Device Ebay Item Number: 370193239339
    From: Gary LaPook
    Date: 2009 May 28, 23:36 -0700

    The ARG 1 on ebay just sold for $513, GBP 320.
    On May 28, 5:11�am,  wrote:
    > Spreadsheet with plots this time.
    > The use, as explained by gl and his attachments, is simple. �Set the index
    > mark on the clear overlay to 90 degrees North. �Put a mark on the overlay at
    > the body's LHA and Dec. �Rotate the index mark to the observer's Lat, read
    > Alt and Zn. �That's it!
    > Creating the plot involved an interesting side trip to Wolff nets,
    > crystallography, "East Poles" and projections. �Google image "Wolff net" for
    > some already made up. �Google web "Wolff net" �for Wolff and diffraction
    > origins. �Wikipedia has equations; check "stereographic projection". �A
    > helpful web site was:
    > http://journals.iucr.org/iucr-top/comm/cteach/pamphlets/11/node4.html
    > A spreadsheet for playing with the projection, and a FORTRAN program to
    > generate the diagram are attached.
    > Attached File: 108425.stereographic.xls (no thumbnail available)
    > Attached File: 108425.arg2.f (no thumbnail available)
    > �stereographic2.xls
    > 58KViewDownload
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