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On Fri, 22 Jan 2010 22:32:51 -0700, Gary LaPook   
wrote:

> You can see the scales have a butt joint.

Thank you for the links.  I downloaded the photos tonight . . . dialup is  
a drag.

I notice that the gap is greatest on the innermost tube, and that there  
seems to be a blotchy appearance to the aluminum.  I wonder if corrosion  
had caused the diameter to "grow" and the paper to slip at the  
pre-weakened butt joint?  An argument (perhaps) for the micarta like paper  
(or cloth) and resin tubes.

>  I had written before that the Bygave cotangent scale went up to 89� 45'  
> but the picture shows it only goes to 89� 40' which may no seem like a  
> big difference but it takes an additional spiral to go that extra 5'.

Mine goes from slightly less than 1 degree (perhaps 2 minutes less) at the  
bottom, and not quite 89d 2 minutes at the top.  Really wasted space, I  
think.

-- 
Richard . . .


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