Next message: Royer, Doug: "Tamaya MS-733 manual"
Alex,
I'm having my first cup of the morning and reading e-mail. I've just
completed the experiment you asked me to do. Actually this turns out to be the
experiment I ran before writing you the first time, but I did it again, following
your instructions one at a time to make sure I got it right.
Without the vanes, just viewing the two parts of the arc, the alignment
changes from the bottom of the mirror edge, where it's nearly perfect, to the top,
where it's nearly a quarter of an inch out. That's because the plane of the
front-reflecting surface is not exactly in line with the axis of the sextant.
And it's the reason for the vanes (dominoes, shotgun chokes, whatever).
I put the vanes on, taking care that they were aligned perfectly with the
inner edge of the flat surface of the arc, and found that their alignment
remained the same from top to bottom of the edge of the mirror.
If your index mirror won't adjust so you get the same result, something is
wrong with it. Perhaps a part is loose or broken, or the mirror surface not
perfect.
Bruce
