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    Ebony Octant
    From: Chris Caswell
    Date: 2019 Mar 11, 15:37 -0700

    Greetings All,

    I was recently gifted an ebony and ivory octant, marked "Blachford & Imray, London", and I am wondering about the 3rd mirror (slitted) and peep sight, as I have never seen this set up before.

    Does anyone know (or want to guess) what it is for?

    Best,

    Chris 44° 30' N 73° 15' W

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