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    Astra IIIb mirror assemblies
    From: Doug Royer
    Date: 2004 Oct 12, 13:54 -0700

    A while ago I procured a "basket case" Astra IIIB sextant and for something
    to do I refurbished the thing.It functions quite well indeed for the amount
    of cash I put into it.It was a fun project and I actually enjoy useing the
    sextant in the backyard.
    There were some issues I'll tell you of now that we're on the subject.
    I purchaced a new horizon mirror assembly(split mirror) and a new index
    mirror assembly.The origonal index assembly was of the old round style
    mirror.What was known as the standard.When I purchaced the index assembly I
    only wished to replace the standard mirror.I was informed the supplier had
    no standard mirrors in stock and sent an entire square(Delux)index assembly
    for the same price.The assembly came with a front silvered  mirror as that
    is how they are made by Astra.Even the instructions on this,the Delux,brand
    new mirror assembly that supposedly has the mirror surface  engineered into
    the correct position reguarding the pivot plane state you must use cylinders
    to null the perp.
    I really don't know if what Jared states is correct.I figured since they
    sent a new front mirrored index assembly to use on the frame that the
    correct procedure to nulling perp on any front silvered mirror was the same.
    The new horizon assembly(split)sent was totally differant from the horizon
    assembly(whole)I was replacing.

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