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On Wed, 28 Nov 2007, Robert Eno wrote:

> Consider a black glass artificial horizon. Frieberger

I've seen one of those and tested it in Freiberger's
office (in Freiberg, Germany).
The price was something like 900 Euro, but they were very
nice to me and offered for only 700 (if I pay cash on
the spot:-)
To try, we put it on the wood table in their office
(on the second floor of a brick building in a quiet
street in a small quiet city) I asked everyone to sit
down and stop breathing for a while. And aimed my sextant
at the Sun reflection (SNO-T, 6x scope). It was shaking
like crazy (5-10 minutes amplitude by eye estimate).

So I decided not to spend 700 Euro for a piece of glass
in a drame with 3 screws and a pair of levels.

Actually I believe that a handyman with simple tools can
make such thing himself. Optical quality glass seems to
be available on the Internet for a reasonable price.

Besides, 30" ADVERTISED accuracy did not seem sufficient
for the sort of observations I am doing.

Alex.

P.S. I don't know whether Ken is reading this (have seen no
posting from him for long time)
but I suggest that Celestaire could make an art horizon of
heavy iron, perhaps it will shake less
(the real ones were made of iron for
another reason: iron does not amalgamate witrh Mercury,
unlike other metals). Only once I've seen an old iron
artificial horizon on e-bay, complete, with iron mercury
bottle). It was sold for $800 about a year ago.




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