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Originally Posted by breadcatcher101
It would be neat having devices (working models) that were used in the war such as you are referring to. They also had a thing-of-a-gig called a "was/is". Maybe it is the same item you are talking about or one that does something else, I can't remember.
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what you are talking about is an is/was, and this is old news here at subsim - many of us have made our own and use them regularly
the original thread, including pdfs for making your own
http://www.subsim.com/radioroom/show...ighlight=iswas
original instructions for using it
http://www.hnsa.org/doc/attackfinder/index.htm
note, this tool is not the same as a spread angle calculator