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Thanks,
I digged out my collection of papers about refraction.
Wollaston and especially Huddart (same transactions, Nov 24, 1796)
describe the cases of inverted refraction (when the ray is bent
away from the earth).
For Cel Nav, they advise taking direct and back sights, and average them,
the thing not possible with modern sextants:-)
They attribute the phenomenon to unusual concentrations of vapor in the
atmosphere.

Alex

On Tue, 20 Mar 2012, Bill Morris wrote:

>
> Alex
>
> You wrote "I still have to dig the old archives on the anomalous refraction.
> I even sort of remember reading a paper of Wollaston in
> the Royal Soc. Proc. where he investigated this for the first time,
> if I remember correctly."
>
> Wollaston's paper is here:
>
> http://www.jstor.org/stable/107055
>
> Bill Morris
> Pukenui
> New Zealand
>
>
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