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    Link Sextant Test Collimator Info.
    From: Robert Swartz
    Date: 2020 Sep 3, 13:08 -0700

    Seeking manuals and documentation on my Link Sextant Collimator which I use to zero the bubble sextants which I restore.

    Before I obtained this instrument, I used the horizon line of Lake Michigan on a clear day at the shore to eliminate dip error as a zero datum for zeroing instruments.

    Laying down on a mat at the lake shore in Wintertime Chicago gets somewhat cold.

    Patent #2,310,031 G.Lowkrantz, Filed May 15, 1941

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