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    Re: Whole Horizon Mirrors
    From: Lu Abel
    Date: 2011 Apr 25, 13:43 -0700
    Missed that part! 

    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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