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Thank you George for welcoming me.

I would like to add to your description of my spiegelboog that, as far 
as known untill now, this instrument was the first ever reflecting 
navigational instrument using a glass mirror. It was invented in 1660 
(patent given on September 25th), which was well ahead of Robert Hooke 
(1666), Sir Isaac Newton (1699), Thomas Godfrey (1730) and John Hadley 
(1731).

As Wolfgang K�berer suggested [NavList 1737] and with permission of the 
Scientific Instrument Society I will provide a copy of the article to 
anyone who is interested. Even better: go to my website and you can 
download it from there (and see other instruments I collect and make):

http://www.dehilster.info/instrumenten/spiegelboog/index.html

The last image on that page is a link to the article in pdf format.

Enjoy reading,
regards,
Nicol�s


George Huxtable wrote:

>Nicol�s de Hilster has recently joined this list, and posted a message 
>(subject: [NavList 1733] German Sextants).
>
>I would like to say "welcome aboard" to Nicolas, who is a hydrographic 
>surveyor from the Netherlands. He attended the recent symposium on 
>historic instruments at Greenwich, and brought with him his modern 
>replica of the Spiegelboog, a development in Holland of the 
>cross-staff and backstaff, merged, with a mirror. He has published an 
>account in the recent Bulletin of the Scientific Instrument Society.
>
>George.
>
>contact George Huxtable at george@huxtable.u-net.com
>or at +44 1865 820222 (from UK, 01865 820222)
>or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. 
>
>
>>
>
>
>
>  
>

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