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    Re: Bubble sextants on e-bay
    From: John Cole
    Date: 2006 Dec 31, 16:07 -0800

    Robert Eno wrote:
    > C.Plath Bubble attachment -- adjustable bubble.
    > This is the next best item. It replaces the telescope on the sextant frame.
    > It is easy to use, easy to repair, robust and bullet proof. I have two of
    > them: one which I keep for spare parts. I have had mine for over 10 years --
    > I purchased it second hand from Ken Gebhart -- and have had no problems,
    > even at minus 40 degrees. Drawbacks: not as accurate and easy to use as the
    > MK IX A. A really crappy illumination system for night time observations
    > (you cannot beat the MK IX's illumination system) and finally, the unit adds
    > considerable weight to the already heavy sextant.
    > It is compatible with C.Plath (pre-and Cassens & Plath. Cannot tell you if
    > it is compatible with other sextants but I am sure Ken Gebhart can answer
    > this question.
    I assume Robert is referring to an earlier C. Plath bubble attachment.
    The bubble attachment being sold currently by Cassens & Plath has an
    excellent illumination system that plugs into the C&P sextant. The
    rheostat provides very fine degrees of illumination and is excellent
    for star sights.
    John Cole
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