NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Welcome to new member (and article spiegelboog)
From: Frank Reed CT
Date: 2006 Nov 27, 00:21 EST
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From: Frank Reed CT
Date: 2006 Nov 27, 00:21 EST
Nicolas, you wrote:
"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 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)."
Of course, the "key" principle applied by Newton, Godfrey, and Hadley was
double reflection. The spiegelboog ("mirror bow"?) has only one mirror and does
not incorporate that revolutionary double-reflection principle. Or did I miss
something?
And by the way, welcome aboard! :-)
-FER
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
42.0N 87.7W, or 41.4N 72.1W.
www.HistoricalAtlas.com/lunars
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To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
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