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On Mon, 19 Feb 2007 19:59:01 -0700,  wrote:

> Does anybody have any information about this type of sextant
> or the similar periscopic ones with a pendulous mirror? Since the
> bubble ones are much more common is the reason for this that the
> bubble ones work better or are they less expensive to manufacture?
>
One comment, not on sextant artificial horizons, but on similar solutions
for theodolites and levels.  I have a Wild T1-A that uses the reflecting
under-surface of liquid in a capsule to provide the zero for vertical
angles automatically, instead of having to watch the ends of a leveling
vial.  (That is the meaning of the "A" in the model description.)  I also
have a Kern DKM2-A that uses a pendulous prism/mirror for the same purpose.

Giving a little tap to the tripod with cause a noticeable quiver in the
vertical angle reading in the hanging mirror type (and lets the operator
know it's working), but is almost nonexistent in the bubble type . . . so
the dampening is much quicker for the bubble.  Also, while both
instruments should be treated gently, there seems to be much more of a
point made of the delicate nature of the suspension wires of the pendulous
prism.

I would be interested in reading how well the two types of sextants behave
for you.

--
Richard . . .
Using Opera's e-mail client since Dialog, "the Dog", died.

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