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    Re: Japanese Navy Type 2 bubble sextant
    From: Gary LaPook
    Date: 2007 Dec 22, 12:57 -0800

    Gary LaPook writes:
    It appears to be an exact copy of the Bausch and Lomb A-6 sextant. I
    have a manual that has operating instructions for this type and can scan
    it and send it to you on Wednesday.
    Maybe you have a good bubble chamber  but just need to use the proper
    method to make the bubble  appear. The instructions are:
    "(1) Size of bubble,-(a) To increase size of bubble point telescope
    downward, and turn bubble adjusting nut in the "enlarge" direction as
    shown on by the arrow engraved on the nut.
        (b) To decrease the size of the bubble point telescope upward and
    turn the bubble adjusting nut in the "reduce" direction. It is possible
    to remove the bubble entirely from the field by turning the nut in
    reduce direction a sufficient number of trurns.
        (c) If nut is rotated while telescope is held in a horizontal
    position, size of bubble is not affected. Therefor if the end of the
    motion of the nut is reached before bubble is adjusted to desired size,
    hold octant so that telescope is horizontal and reverse direction of
    rotation of the nut as far as it will go. Then return to operation under
    (a) or (b) until desired size is attained."
    Hope this helps.
    Ronald van Riet wrote:
    >hi all,
    >I just got me a beautiful WWII era Japanese Navy Type 2 bubble sextant
    >and would like to have a go at getting it back in working order.
    >The big knob to set the altitude runs very smoothly and the overall
    >look of the thing is pretty good
    >One obvious problem is the corrosion in the battery compartment, but
    >even more important is the fact that I have no bubble.
    >Would anyone have instructions on how to fix this type of sextant or
    >have any documentation on this sextant whatsoever (even in Japanese,
    >pictures could say a lot even if I couldn't understand the text)?
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