P3D Re: GLueing on levels

[Paul Talbot <ptww@xxxxxxxxx>]

Greg Wageman wrote:

> All the spirit levels that I know of are
> based on gravity pulling a liquid down and the buoyant bubble rising to
> the high point of the curved container.  They don't work upside down!
> 
> You would need to mount a level that can be viewed through its
> underside, such that it is inverted when the camera is right-side-up and
> right-side-up when the camera is inverted.

The keychain level that I mentioned Friday, that kind of led
to this thread, happens to be encased in clear acrylic.  It is
viewable from all four sides and doesn't seem to care whether
it is below me, above me, behind me ;-), etc.

Anyone who wants one can contact me off list.

Paul Talbot