NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Lu Abel
Date: 2011 Apr 25, 13:43 -0700
Thanks
Lu
From: Greg Rudzinski <gregrudzinski@yahoo.com>
To: NavList@fer3.com
Sent: Mon, April 25, 2011 1:37:49 PM
Subject: [NavList] Re: Whole Horizon Mirrors
Lu,
Good find on the patent details.
What I wasn't aware of was the corrosion resistant nature of the reflective coating on whole horizons.
The patent states:
In addition to the ability to be spectrally selective, dielectric beamsplitters are very resistant to corrosion from salt-water--about as resistant as glass itself. This is a great advantage over the standard silvered semi-mirror used in prior art sextants. The invention has further use in rangefinders, particularly of the stadimetric variety.
Greg Rudzinski
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