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Perhaps you've discovered a new correctable observation error: the
"bulldozer error". If you could come up with a set of correction tables,
perhaps there is a paper to be submitted to the Institute of Navigation ;-^)

Robert

----- Original Message -----
From: "Fred Hebard" 
To: 
Sent: Tuesday, May 24, 2005 9:54 PM
Subject: Re: Troughton circle in Dresden


>I was hoping to be able to write up my visit with Alex, which
> occurred right as he was leaving for Europe, and also at a busy time
> for me.  The SNO-T had excellent optics, in my opinion.  I also liked
> the light weight, at Alex mentions.
>
> We were taking artificial horizon sights of the sun from Alex's
> famous shaky porch, and a large bulldozer leveling ground nearby was
> shaking the porch enough that it was hard to find a moment when the
> images weren't quivering.  I don't know whether it the vibrations
> from the bulldozer were being transmitted through the ground or
> through the air from its noisy exhaust.  Alex's apartment is built on
> fill on or near a swamp, so the ground may be quite easily vibrated.
>
> Between the bulldozer and being rushed for time, I wouldn't put much
> stock in our observations for accuracy, but we got to handle each
> other's instruments.
>
> I'm really glad Alex has found a place that will calibrate sextants!
> And also glad that he can now trust the accuracy of his.
>
> Fred Hebard
>
>
> On May 24, 2005, at 1:59 PM, Alexandre Eremenko wrote:
>
>>
>> I recently had an opportunity to try the brass sextants
>> of Fred (CP and a small Husun/Mate). I found them extremelly heavy:-)
>> My hand was tired.
>> And Fred said he liked my aluminium SNO-T, because of its lightness.
>>
>> A
>>

   

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