> Jim
> Who, a long time ago, took a class in making glassware
> for chemistry, and can still probably size, curve, and
> seal a tube(if absolutely necessary B^)).
> Oh, and who paid $3 for the level.
> 

I think they are filled with alcohol, and it is said that if left
in dealer's glass display cases on a hot sun day, you start to
lose the alcohol. My dad's old Stanley level was his father's originally,
and either my brother or I broke one of the vials when we were
kids. The other two are fine, and the thing is as accurate as my
new aluminum 4 ft model.

	Steve