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    Re: Another "emergency navigation" sight reduction method
    From: Gary LaPook
    Date: 2015 Jul 12, 00:26 -0700

    The cotan scale on my flat Bygrave is only 10 inches long by 7 inches high and I get 2 minute or better accuracy. The cosine scale is smaller. They each fit on standard 8 1/2 by 11 inch paper and clear plastic sheets.

     

    gl

    https://sites.google.com/site/fredienoonan/other-flight-navigation-information/modern-bygrave-slide-rule/1.JPG?attredirects=0

    https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxmcmVkaWVub29uYW58Z3g6ZDY4NzI5MjczZmYyM2U4

    https://sites.google.com/site/fredienoonan/other-flight-navigation-information/modern-bygrave-slide-rule/2.JPG?attredirects=0

    https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxmcmVkaWVub29uYW58Z3g6NTljYTBhYzY4MzFiMzNjYQ

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