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    Re: The ultimate celestial navigation time piece
    From: Bill Lionheart
    Date: 2017 Feb 24, 06:43 +0000

    I wonder if anyone considered a way to display the time in the sight
    tube or telescope  (half silvered mirror?) .. a kind of head up
    display sextant. Obviously it could be done I am just wondering if
    there is an easy way.
    
    Bill
    
    On 24 February 2017 at 04:28, Francis Upchurch
     wrote:
    > Tony,
    > For the eccentric minority who like to use mechanical, non electronic time
    > pieces, I have details on 2 affordable (under $100), automatic, modern build
    > watches with regular, chronometer type  going rates.
    > Please use private email and I can send more details.
    > Best wishes
    > Francis
    >
    > -----Original Message-----
    > From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Tony Oz
    > Sent: 23 February 2017 23:14
    > To: francisupchurch---.com
    > Subject: [NavList] Re: The ultimate celestial navigation time piece
    >
    > As Frank has correctly guessed about me being a technophobe (to some extent)
    > - I'm trying to avoid everything electric/electronic/modern. More so - in
    > the field of Emergency Navigation.
    > I'm modelling a replacement handle - a grip rather - for my sextant. This
    > grip is thought to be a thick roundish plastic board (approx the size of
    > ping-pong bat) with holes for all five fingers separated around the central
    > area, where a split-system stop-watch (mechanical, of course!) will sit -
    > face to the palm. An index finger will be aligned at the split/resume
    > button.
    > I intend to do it like this:
    >   -- with some reference watch I am to start the stop-watch at a full minute
    > of UTC;
    >   -- to write down that time in a log-book;
    >   -- to shoot a sight and press the split/resume button freesing one of the
    > stop-watch arms - to be able to write down the stop-watch readings without
    > any hurry - along with the sextant's reading;
    >   -- having the angle and time interval readings properly recorded - to
    > press the split/resume button again (preparing the stop-watch for the next
    > sight) and proceed with the sighting as described in the previous step;
    >   -- when finished with all the sights - to use the reference watch to stop
    > the stop-watch on some full minute of UTC;
    >   -- to write down that reference watch readings;
    >   -- to use the recorded stop-watch intervals to place the sextant readings
    > on the UTC time-scale accordingly.
    >
    > I guess this is how it is/was done by serious navigators.
    > The only question remains - where a techophobe gets a reliable mechanical
    > "reference watch" (for little money, I mean)?
    > :)
    > Regards,
    > Tony
    >
    > [plain text auto-generated]
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    > View and reply to this message:
    > http://fer3.com/arc/m2.aspx/ultimate-celestial-navigation-time-piece-TonyOz-feb-2017-g38410
    >
    >
    >
    >
    > View and reply to this message
    
    
    
    --
    Professor of Applied Mathematics
    http://www.maths.manchester.ac.uk/bl
    

       
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