NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Sextant mirrors
From: Jim Martin
Date: 2007 Oct 08, 17:54 -0700
From: Jim Martin
Date: 2007 Oct 08, 17:54 -0700
Issue 96 of the Nav.Found,newsletter has an article concerning
mirrors.In which the author suggests that in an emergency the mirrors
may be replaced,using any type of mirror available e.g.vanity,hand
etc.It is my understanding that sextant mirrors are manufactured from
an optically flat material,which to me means that not only the two
sufaces be flat but,also the refractive index.Is this correct.I have
read that using ordinary glass results in multiple images.
Jim Martin.
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