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Frank Reed had described an observation of remarkable short-term instability
in a plastic sextant, and I had asked for further details of the
measurement.

I though I had understood exactly what he was doing, until these words-

"In any case, the sextant was lying
| on its side and completely untouched during this test. What I was
describing
| was looking through a 10x scope without touching it at all. One could
| visibly see the changes in just a few seconds. Very entertaining! "

Which raises a few further questions; if Frank will help a bit further,
about the measuring setup in use, which I am trying to picture. It seems to
be somewhat different from the usual angle observation that's made with a
sextant.

Does the plastic sextant he was testing REALLY include a 10x telescope
option? Or was the 10x scope added as an aid to precision? Where, in the
optical system, did it go?

If two-arc-minute changes were being observed, how were they being measured,
if the instrument remained untouched throughout?

A simple diagram would work wonders.

George.

contact George Huxtable, now at george@hux.me.uk
(switched from george@huxtable.u-net.com)
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.



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