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Brad,
This is not a collimation adjustment.
The rising screw moves the tube parallel to itself.
(Collimation is the adjustment of the direction of the tube.
When you rotate this rising screw, the direction does not change).

It adjusts relative brightness of the two images:
when the telescope line is directed exactly on the dividing line
of the split horizon glass, you get equal amounts of light
from these two halves. When raise the telescope it gets more
from the horizon, and less from the index glass, and vise versa.A

As you know from experience, this feature is absolutely crucial
for the dip meter, but there it is the diaphragm which does this.

Alex.

On Tue, 10 Dec 2013, Brad Morris wrote:

>
> The rising feature allows you to adjust the reflected light path compared
> to the direct light path.
>
> The collimation of the scope directly affects the precision of the
> measurement.
> On Dec 10, 2013 5:33 PM, "Norm Goldblatt"  wrote:
>
>> ------------------------------
>>
>> School me, oh wise ones. The telescope adjustments are not very critical,
>> are they? As long as it's roughly centered on the horizon mirror, Seems as
>> though, perish the thought, a threaded bolt and two locknuts for height and
>> a twist for horiz. and a little non-elastic bending of 'rising piece' bolt
>> would do 'er and actually be pretty solid. The rising piece on my T&S has a
>> bit of play which I can't see how to get rid of, the two #3? screws that
>> adjust vertical (perp to plane of sextant) are quite 'dinky' and given the
>> torque that could be accidentally applied to the longest of my telescopes
>> could damage them.
>>
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