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    Re: Hamilton 992B as Marine Chronometer
    From: Francis Upchurch
    Date: 2016 Dec 31, 19:28 -0000

    Sorry, new year typo. Carpe diem!

    francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
    Sent: 31 December 2016 17:14
    To: francisupchurch---.com
    Subject: [NavList] Re: Hamilton 992B as Marine Chronometer

     

    Greg,

    Thanks for the heads up on Hamilton Railroad watches.

    They still look to be mostly over 300$ on ebay. So only  relatively budget sensitive.

    Do you have any knowledge or experience of the Russian copies like MOLNIJA  which are on ebay for 30-40$ Also, a while back you discussed the US airplane 8 day clock as recommended by Letcher?

    From my own experience, my modern Chinese made Rotary Retro look watch, (about 100$ 10 years ago, now about !30$) if worn constantly, (presumably providing consistent movement and temperature) has a regular rate of -15 secs per day and over a test period of over a  month, using predicted rate, performed within the requirements of the longitude prize. (It is water proof to 50m and self winding)

    Also, if I was going on this trip, I would probably take a Seiko mechanical dive watch circa 150$. (probably 2 of them). Shake, drop, water , bullet and probably lightning proof.

    If we have SW radio time checks, time is not going to be a problem is it?

    In addition to my Bygrave, could I take my Fuller as well (Fuller 2 still made in 1960’s). That would do most calculations to 4-7 decimal places.

    I would also take HO 208 and Fletcher ,+ Hewitt’s commonsense to get me out of left field problems. (is Doniol allowed? Recent but based on pre 1960s knowledge?) I would probably also do lunars using Thompson abbreviated method with my Fuller.

    Main problem for me ,is I could have probably done this 10 years ago, (and had the right boat then!) but not now. (dream on! Lesson , Cape Diem! Now, not some time in the future!)

    Happy new year all.

    Cape Diem!

    Francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Greg Rudzinski
    Sent: 30 December 2016 19:34
    To: francisupchurch---.com
    Subject: [NavList] Hamilton 992B as Marine Chronometer

     

    The Hamilton 992B Railroad Special can serve as a cost effective mechanical marine chronometer for celestial navigation if kept horizontal at constant temperature. See link:

    http://linuxfocus.org/~guido/hamilton-992b/

    1970 was the last year of production so if a sailor trys to use one for CN then it should be serviced by a professional (good for five years) then rated in the position as secured onboard before a journey/race. This would be a cost saving choice to consider as a small craft racer in the 2018 Golden Globe Race. 

    Greg Rudzinski

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