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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
>
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--
Professor of Applied Mathematics
http://www.maths.manchester.ac.uk/bl

   

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