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Doug wrote-

The 2 liquid levels are
>positioned close to the edge and positioned on the top surface of the A.H.
>on  2 axis.I used a watery plexiglass adhesive to bond the levels to the
>plexiglass surface.

From George-

A snag with bonding the levels in that way is that you are then unable to
pick them up and turn them end-for-end (a test which inspires confidence).
Another snag may be that for low altitudes the levels may get in the way of
the light, unless the plate is rather large. And if the plate IS rather
large, isn't it better to test with the level the part of the surface where
the reflection is happening, not another patch near the edge?

I would be interested to discover what accuracy listmembers have been able
to achieve when using such solid levelled horizons.

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