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On Apr 20, 2005, at 12:21 PM, Alexandre Eremenko wrote:

>>> I know a very clever method of calibrating your sextant
>>> "at home" that is without stars, but you need a theodolite
>>> or another instrument more precise than the sextant,
>>> and with precise level.
>>> Can describe the method to the list if anyone is interested.
>>> (I recently read about it in one XIX century paper on
>>> the Internet).
>> Please do publish.
>> Bill
>
> The article is available on:
> http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=
> 1865MNRAS..25...56T&db_key=AST
> but I am not sure whether it's free or Purdue pays for
> subscription.
>
> But I am afraid that my conclusion that it is a clever method
> was somewhat premature:-)
> Trying to describe it with my own words I found that it is
> hardly practiceable with the sort of ordinary theodolites
> I've ever seen:-) A theodolite with hudge objective lens
> is needed...
>
> Alex.

I was able to read the article, so it must be accessible to everybody.
The "bibcode" is on the second line of your link as I received it.  The
carriage return needs to be removed from the middle of the link.

I believe Chauvenet mentions calibration with a theodolite, or else the
Hydrography text (which is home while I'm at work).

I couldn't find mention in this work of the need for a theodolite with
huge objective lens.  Is that in the original work by Sims?

   

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