A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Date: 2014 Dec 3, 19:11 -0000
That is basically the Luykx paper that started the whole thing and I’ve cited in my earlier postings, but many thanks for your help here. With Harri’s excellent computer generated scales /graphs and the Brown paper (1944) plus the photo of the original in the SI, I think we now have a working replica. And it works!
Watch this space. I think this will turn out to be a very interesting forgotten device. Probably the easiest and quickest method of getting Hc from Lat, LAH and Dec.(faster and easier than the Bygrave)
So far, I’m getting remarkably good results with a very basic prototype that took only minutes to make.(albeit with Harri’s wonderful graphs!). It is becoming my favourite device!
Interstingly enough this site from Starpath School in WA state which hosts the Navigator's Newletter archives covered the use of the Brown-Nassau SC in 1998.
Here's a link to the whole Newsletter, and the story on Brown-Nassua is about 10 pages in.
Hope this helps and that I am not repeating information.