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    Re: Brown-Nassau CN Plotter
    From: UNK
    Date: 2014 Nov 20, 14:41 -0000

    Thanks Greg,

    In that case, I’m going to have to build one!

    Any US volunteers for a visit to SI?

    I did visit it many years ago when I came over for an FDA hearing, but I didn’t know about this device then!

    I’m not well enough to do the trip for the foreseeable future.

    Worse case is I could build a primitive experimental prototype using the simplified graph curves in the Brown paper, hopefully edited in photoshop to add verniers etc. Or someone may fancy generating new curves from the trig equations described in the paper? Hanno says I should learn how to do this and I guess he is right!

    Francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Greg Rudzinski
    Sent: 20 November 2014 14:31
    To: francisupchurch---.com
    Subject: [NavList] Re: Brown-Nassau CN Plotter

     

    Francis,

    Closer inspection of the SI image shows the BN has 30' verniers to obtain higher precision. Sort of like a plastic sextant calculator. 3' precision is possible.

     

     

     

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