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On Nov 25, 12:43 pm, "George Huxtable" 
wrote:
> Alex wrote-
>
>>
> Not sure that it was me, though it was a good question. I would like to ask
> some supplementary questions.
>
> Has anyone on this list, by measuring star-star distances or by any other
> method, ever discovered reproducible errors, outside the terms of a
> calibration certificate or maker's warranty, in a sextant? Has anyone made
> calibration measurements of his own, in which he has more confidence than in
> the manufacturer's scale readings, corrected as necessary by the box
> certificate? And if the answer is yes, what's the magnitude of those errors?
>
> =====================
>
>I am in the process of doing so by two methods. One uses two collimators 
aligned using a second-order theodolite. The other will use two 
autocollimators, a largish(600 x 900) surface plate and a plane mirror. Using 
the first method I will compare a Pioneer-Bendix Mk II with an SNO-T and 
using the second, those two sextants and a MkIX bubble sextant. I will report 
to the list in a week or three. The first method is very tedious. The second 
promises to be so. So far I have discovered some differences from the 
certificates or claimed accuracy, of up to 0.4 arc-min, but it's early 
days...

Bill Morris


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