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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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