A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Date: 2014 Nov 20, 14:41 -0000
In that case, I’m going to have to build one!
Any US volunteers for a visit to SI?
I did visit it many years ago when I came over for an FDA hearing, but I didn’t know about this device then!
I’m not well enough to do the trip for the foreseeable future.
Worse case is I could build a primitive experimental prototype using the simplified graph curves in the Brown paper, hopefully edited in photoshop to add verniers etc. Or someone may fancy generating new curves from the trig equations described in the paper? Hanno says I should learn how to do this and I guess he is right!
Closer inspection of the SI image shows the BN has 30' verniers to obtain higher precision. Sort of like a plastic sextant calculator. 3' precision is possible.