NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: New sextant mirrors for old
From: Greg Rudzinski
Date: 2009 Feb 11, 15:31 -0800
From: Greg Rudzinski
Date: 2009 Feb 11, 15:31 -0800
Bill,
Excellent illustrated instructional blog. Thanks! The question
now is how to go about fabricating split and whole horizon mirrors?
Greg
On Feb 11, 2:28�pm, wrote:
> 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
atwww.sextantbook.com.
>
> Bill Morris
> Pukenui
> New Zealand
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