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From: Alexandre Eremenko (no email)
Date: Mon May 23 2005 - 15:57:54 EDT
Bill,
> Is the 4" plus minus along the arc?
The table of correction is
0 10 20 30 40 50 60 70 80 90 100 110 120
0 -4 -4 10 6 -1 4 5 -5 4 4 3 14
The first line in degrees, the second one in seconds.
When rounde to tenths of minutes
it never exceeds 0.1' except 2 times
when it is roughly 0.2'
The errors I had in star distances are usually larger,
and always positive. In principle they can be attributed to backlash,
but I never measured anything after the sextant test.
> What sort of minor problem did the scope have, and which scope?
The eyepiece on the 3 times 40 scope was somewhat loose, shaking.
(Another case of backlash:-)
I did not really care much about this scope because I find my inverting
one better under all conditions.
They put some thick layer of oil/grease in it. Now it works smoothly,
and does not shake.
I asked what sort of oil was this, it was written "Carl Zeiss" and some
number on the can. They only said "it is not for sale":-)
I asked for how long will it last and they said "for long".
Alex.
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