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Diving in the list I have found some references to the circle:
- In [NavList 1501] Alex Eremenko write: In Bremerhaven museum I saw some very 
interesting reflecting circles (by Pistor and Martens), equipped with 
detacheable oil lamps on each vernier.
Alex, have you got any pics to share? 

And Frank Reed said that in Mystic there are some circles.
Bowditch and Chauvenet Vol.2 have included a description of this instrument.. 
Really, they were used in the States?



[NavList 7580]:
---1. It's pleasing to note that the Royal Society is again providing copies 
of its historical papers free of charge. Normally, they are only available 
rather expensively, through Jstor. I don't know how long this will last.

--> George, See http://royalsociety.org/ : "Royal Society Publishing is 
pleased to announce that our online journal content is now hosted on the 
HighWire H2O platform and, to celebrate, all our published content will be 
FREE to access until 31 March 2009."

---2. Even for those that may have no technical interest in that paper itself, 
it's worth taking a look at the quality of the engravings. ... Nevertheless, 
to my mind they compete with any work-of-art as 
things of beauty. Is that just my odd mind? What do others think?

--> I am totally agree with George, the engravings are very beautiful, something like a 1800�s CAD 3D


[NavList 7581]:
Clive, is it possible to hear your comments about your circle?... 
 

Andr�s Ruiz
Navigational Algorithms
http://www.geocities.com/andresruizgonzalez

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