A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Date: 2014 Nov 23, 06:51 -0000
Thanks so much Hanno,
I think that is a very good fair deal!
It takes quite a while to build a Fuller, so it may not actually happen until the new year, but I would be very happy to build you one. What model would you prefer, the full sized Fuller 2 replica, the mini version of this (similar size to the Bygrave) or the mini2 to my own design based on the Otis King format? Be aware that I have replaced the Log scales on my Fuller 2 replica with cosines which are more useful for me doing spherical trig equations etc. I am still waiting for Wayne Harrison to supply me with cosine only scales. My current model has sine scale with cosines in red going in the opposite direction. It works fine, but is a bit cluttered.
Let me know what you would prefer.
:) - well, not make me fuller but a Fuller, of course.
But I don't know if that would be a fair deal for you.
If it is than please let me know.
On Fri, Nov 21, 2014 at 10:21 PM, Francis Upchurch <NoReply_Upchurch@fer3.com> wrote:
Fascinating stuff. I think Brown used a standard sextant with spirit level attachment to give AH/bubble?
Don’t think he had the Booth bubble in 1919, did he? But he did have the “Baker navigation machine” which looks interesting, rolling continuous chart with pre-computed Altitudes?
Curious that for his 1931 Tasman sea flight, Chichester had tried the Booth bubble sextant, found his navigation 700 miles out and reverted to a standard sextant and natural horizon altitudes. He claims to have invented his own “pre-computed sun Alts” system. Would he have been aware of the already invented Baker machine?
Any views Gary?
This should answer your question, see attached.
From: Fred Hebard <NoReply_Hebard@fer3.com>
Sent: Friday, November 21, 2014 9:21 AM
Subject: [NavList] Early methods of air navigation
The discussion of the Brown-Nassau CN Plotter brought to mind the following question. What methods did the early pioneers of trans-Atlantic flight use for navigation, such as Alcock and Brown? Brown was the navigator on that flight. They made landfall near their intended destination. Running down a line of latitude would be a clear choice, but how measure the latitude? They flew at low elevations, so perhaps using the actual horizon? Dip scales as the
square root of elevation. The error for being 50 feet off in elevation is less than two minutes of arc at 200 feet. In contrast, Admiral Coutinho installed levels on his Plath in 1919. Had the British? Then there is RDF, which was available in the U.S. by the Point Honda disaster.
Those are some guesses. What does the documentary evidence say?