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    Re: Sight reduction method history
    From: Gary LaPook
    Date: 2013 Nov 2, 22:44 -0700
    I December 2008 I made a series of posts comparing the various methods of sight reduction under the topic of "Chichester's calculations" by working the same reduction with the different methods so you can review them here:

    http://www.fer3.com/arc/sort2.aspx?y=200812su&y2=200812&author=&subject=
    Make sure you scroll all the way to the bottom of each posts where the attachments are located.

    gl



    From: Alan S <alan202@verizon.net>
    To: garylapook@pacbell.net
    Sent: Saturday, November 2, 2013 9:21 PM
    Subject: [NavList] Re: Sight reduction method history


    Lu Abel:
    As to your question, how people did it before silicon, I suppose they used log tables, which would be terribly tedious I expect, from what I remember of using log tables. Possibly, some people might have tried slide rules, though I question the obtainable accuracy. Of course, that being said, what do I know.
    As to tabular methods, wasn't H.O. 211 one of the first such methods in this country? I believe H.O. 214 came into use on the late 1930's, while H.O. 229 dates from the 1970's, correct me if I'm wrong. There are or were other methods too.
    Alan
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