NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Measuring sensitivity of precision levels
From: NavList
Date: 2009 Mar 1, 05:01 -0800
From: NavList
Date: 2009 Mar 1, 05:01 -0800
Hi I have been reading this forum now and then as I find the theory and mechanics of celestial navigation very interesting (from my armchair in the norwegian inland that is :-). A little while back I bought a Mk IX bubble and a Hezzanith regular sextant and I think I will have them in working order very soon. As I live inland I need some sort of artificial horizon for the Hezzanith. I have gotten hold of some mercury so it should be well covered, but this is a hobby, so I have bought some levels for a mirror horizon. One type is marked 20"/2mm and the other is claimed to be 4"/2mm (!), no documentation. I find thees claims somewhat optimistic at about $25 each new. They are however very sensitive. My question then is: Does anybody here have a quick and easy method of testing the sensitivity of levels? The best I can think of is sticking them on a laser and point it at a mirror at some distance, sending the beam back to a screen at my end. That would only give me about 5-6mm shift on the screen pr 20" if the mirror is at 50m. I am not sure how readable that will be. I would be grateful for any ideas. Hein Bodahl ----------------------------------------------- [Sent from archive by: navlist-AT-sveengard.no] --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
