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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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