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Dear Paul,

> That's a good point.
> The test procedure for the Navy Mark 3 sextant used
> two collimators and a precision rotary table.

I understood from your previous message
that you have a theodolite and collimators
and you are going to make these tests soon,
and tell us the results for the three sextants
you mention.

But a precision rotary table is related to another
experiment. Or you have this piece of equipment as well?

In your previous message you mention that all needed
equipment is available on e-bay. Perhaps.
From time to time I look for a theodolite there,
and the price of a Wild T2 that you mention is well
over 1000 bucks, usually closer to 2000.
They rarely mention the angle resolution of theodolites
on e-bay (as it happens with sextants, the sellers usually
have no idea what the instrument is for, and do not
answer technical questions). Few Russian theodolites I saw
are cheaper than T2 but in most cases I don't know how
accurate they are. Some are mentioned with 5" resolution
which is the bare minimum for sextant testing.

Alex.


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