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Re: An artificial horizon opportunity?
From: Brad Morris
Date: 2017 Jan 29, 14:02 -0500

David

I suggest you fill your screen with the artificial horizon in the image of Amundsen at the pole. It looks like there are adjustable (nuts and threaded rod?) legs in the front right and rear right corners. To my eyes, we also see the top of one in the back left. That would be consistent with a mirror!

Your milage may differ. That's what it looks like to me

Brad

On Jan 29, 2017 10:59 AM, "David Pike" <NoReply_DavidPike@fer3.com> wrote:

Randall you wrote: For an artificial horizon I use a first surface mirror on a round metal plate. It is adjusted on 3 screws with 40 TPI. Using 2 spirit levels I routinely get less than a mile accuracy in any wind. Ahmundson used this in his polar explorations. Instructions for making the levels are posted in the archive.
Did Amundsen always use a mirror? I always thought that at the South Pole at least he poured liquid mercury into a tray. Carefully stored it would probably still be liquid. Photo and text here http://www.southpolestation.com/trivia/igy1/polesurvey1.html (photo possibly taken earier in the jourey), but I could be persuaded that you can’t always believe everything you see and read on the www. I've also read that he took a mirror and a spirit level as stanby in case the mercury froze https://www.theguardian.com/notesandqueries/query/0,,-1024,00.html DaveP

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