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    Phi-Prime,Phi-2nd and perpendicularity
    From: Doug Royer
    Date: 2004 Oct 12, 11:57 -0700

    I followed your advice on looking into "Cugle's Practical Navigation" and
    Chapt. XXXII on Ex-Meridian procedures.
    The book I found yesterday(the ONLY copy in town) in an old book store was
    printed in 1952.In the chapter dealing with Ex-Meridian sight procedures NO
    mention of the Phi-Prime,Phi-2nd procedure was included.
    I am interested,but not to the point of wandering all over creation to find
    a suitable volumn,in what the Phi-Prime,Phi-2nd procedure is.
    Could not someone just give me a run down of the procedure?
    As for what Gearge states about the rear vs front silvered mirrors I can't
    answer his questions or concerns out right.I only go by what I've read in
    various books and manuals discribing both procedures of finding
    perpendicularity in front anf rear silvered mirrors.Whatever the procedure
    states in an owner's manual reguarding how to accomplish  the task is what I
    follow without giving it to much thought.I will state that when I had to
    replace my index mirror on the Tamaya due to a blemish in the rear silvering
    I couldn't get the mirror perp useing the arc method.The Tamaya manual(I've
    sent the relavant paragraphs)specifically states one must use
    cylinders(dominoes,choke tubes,dice)to accomplish the task.

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