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John wrote:
> 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

Eno responds:

Correct John. The earlier C.Plath attachment is the one to which I am
referring. It has a provision for adjusting the size of the bubble which I
believe is a crucial feature. A photograph of one can be found on page 386
of Dutton's, 12th edition (article 2206 provides a brief discussion on
bubble sextants). I had one of the Cassens and Plath models that you
referred to and after a few weeks, returned it to the dealer. I simply did
not find that it performed to my satisfaction.

Robert


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