NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
New sextant mirrors for old
From: Bill Morris
Date: 2009 Feb 11, 14:28 -0800
From: Bill Morris
Date: 2009 Feb 11, 14:28 -0800
My thanks to all those who replied to my question "How flat do sextant mirrors need to be?" The answer seems to be that they should be flat to within a wavelength of light. When restoring sextants, I sometimes resilver the mirrors of antique ones, but with more recent instruments, I make new mirrors out of modern float mirrors glass, as it seems to be of adequate flatness. For those who wish to follow suit and finish their mirrors properly, I have posted an illustrated instructional blog at www.sextantbook.com. Bill Morris Pukenui New Zealand --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
