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    Re: Hong Kong sextants
    From: Stephen N.G. Davies
    Date: 2017 Mar 11, 11:59 +0800
    Well, since I populated the case and acquired most of the exhibits between 2005 and 2013, I can add a small bit of info. 

    Starting at the top we have
    1. A replica cross staff made for HKMM by New England based replica instrument maker Gregg Germain
    2. The Thaxter sextant correctly identified by Sean C, but c.1860s (from evidence on the case)
    3. What the Museum’s caption wrongly identifies as a Troughton Repeating circle, c.1805 (after more research I tried to get the database and caption changed but was told there wasn’t time - it is actually a rare example of 4. Troughton’s three armed reflecting circle (it couldn’t repeat), a sort of circular sextant that Troughton was convinced (but no one else was, was a perfect answer to problems of scale making error - then Jesse Ramsden came along; beautiful other examples at http://americanhistory.si.edu/collections/search/object/nmah_1197876; http://www.bbc.co.uk/ahistoryoftheworld/objects/PPaYiwueRfmdur-3Tg3tQA; and http://collections.rmg.co.uk/collections/objects/42283.html - good exploded diagram (of a sorts) of how it was put together at http://www.ssplprints.com/image/106896/lowry-w-troughtons-reflecting-circle-1817
    5. An early 19th century octant by Frodsham & Keen, Liverpool
    6. The Davis Backstaff, no maker identified, is an 18th century example
    7. Kelvin Hughes sextant (No. 67830. date 13.11.68) belonged to my late brother-in-law, a Shell Tankers master
    8. 6.5” radius Plath micrometer, No.10340 made 1935
    9. Tucked over in back barely visible, a Heath & Co, ‘Bell’ frame sextant, c.1910, that had belonged to Lt Cmdr CWA Baldwin RN

    On the case bottom:
    10. 1990s Magellan handheld GPS310 that I used to own
    11. 19th century Islamic quadrant (primarily for religious orientation and date confirmation, not position finding purposes)
    12. Trimble 4000 GPS from the 1990s (S/N: 3033A01077 A)  
    13. 1838 artificial horizon by Thomas Jones with glass and brass cover, mercury tray, ivory mercury bottle and box     

    Hope that helps.
    Best,
    Stephen D          

    Dr Stephen Davies
    c/o Department of Real Estate and Construction
    EH103, Eliot Hall
    University of Hong Kong

    Office: (852) 2219 4089
    Mobile: (852) 6683 3754 

    stephen.davies79@gmail.com
    daiwaisi@hku.hk


    On 11 Mar 2017, at 9:23 AM, Sean C <NoReply_SeanC@fer3.com> wrote:

    Well, for starters:

    Brass and Ivory Sextant; Thaxter and Son, Boston; late 19th/early 20th century

    Kelvin Hughes Sextant; Great Britain; 1968

    Repeating Circle; Edward Troughton; ca. 1805

    C. Plath Micrometer Sextant; Hamburg, Germany; 1935

    ;)


       
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