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    Re: Perpendicularity and other qstns.
    From: Herbert Prinz
    Date: 2004 Oct 13, 13:06 -0400

    Alexandre Eremenko wrote:
    > Herbert Prinz:
    > "You are describing a parallactic effect which can only be caused by a
    > different
    > distance of the individual cylinders from the front edge of the index
    > mirror."
    > No, this is not what I am discribing.
    a few hours later
    Alexandre Eremenko wrote:
    > I think I found the reason of the disagreement in
    > our experiments. [...]
    > The point is that the "right edge of the index mirror"
    > (where the images of two visors should come together)
    > is NOT at equal distance from the visors.
    I am glad Alexandre was finally able to find the reason himself (or at
    least he thinks he did). Such are the blessings of mathematics: You can
    lock yourself into an ivory tower and find out the truth all by yourself
    without trying to understand what anybody else says.
    Herbert Prinz

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