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On 15 Jul 2003, at 5:40, Jared Sherman wrote:
> I confess, my mind is churned to butter from trying to figure out how
> spirit levels REALLY work, somehow we never learned the physics of
> them in school. Perhaps one of you could be so kind as to explain this
> to me.
A modern spirit level has a taper ground into the inside of the glass
tubing. Older levels had parallel sides but the tubing was curved. I'm
afraid I don't know how accurate typical spirit levels are but my
experience with construction-grade levels suggests that they are
rather coarse.
Ken Muldrew.
