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    Re: Brown-Nassau CN Plotter
    From: UNK
    Date: 2014 Nov 20, 14:10 -0000


    Looking closely at the SI photographs, and reading between the rather vague  and incomplete lines of the Luykx paper, it seems that one side has a rotor with verniers A and X (as on the SI photo), and the other side B has the rotor going the other way with verniers B (see Luykx) and presumably Y instead of X. So maybe the verniers increase the accuracy? You choose which side A or B according to the index.

    Anyways, what I really need to make a replica is an accurate full sized scan of both base plate grids with the rotors moved out of the way and accurate scans of both A and B rotors. It should be reasonably easy to print them on plastic sheets.

    I guess the best way to get that would be to go see the thing at the SI (however, it is not on display but   either on loan or in storage). I have emailed SI and asked for scanned  high quality photographs as above.

    If anyone lives near the SI and fancies taking a look, please let me know. I’ll give you my wish-list!

    The SI website states that they lend out items to other bone fide museums etc. I wonder whether Frank’s Mystic Seaport planetarium  could borrow it?

    Just a thought.



    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Greg Rudzinski
    Sent: 19 November 2014 21:16
    To: francisupchurch@gmail.com
    Subject: [NavList] Brown-Nassau CN Plotter


    Here is a link to a Smithsonian image of the Brown - Nassau plotter. Looks to me like 15' precision is all you are going to get out of it.



    Greg Rudzinski


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