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George,

On Mon, 7 Nov 2005, George Huxtable wrote:

> It's important, for a sextant, that both lines of view (to Sun and to
> horizon) are in the plane of its frame, which is at right angles to the axis

It is important because you have a frame with the scale attached to it.
And measure the angles using this scale.
It seems to me that in Bris sextant NOTHING is important:-)

You just glue three pieces of glass very approximately.
The only thing that is important is that the assembly is rigid,
the glass panes do not move about each other.

Then they will deflect the Sun rays by some fixed angles,
you do not care much what these angles exactly are.
(You will just measure them when you graduate the device).

Then the only point is that these angles remain fixed. And that's it.
As I said in my previous message, my own Bris is made in a very sloppy
way.
The beauty of the invention is that IT DOES NOT MATTER,
and does not affect precision.

Alex.

   

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