I found a bag full of strange glass tubes in my late uncle’s bedroom drawer. I have no idea what they’re for, but I’m really intrigued….⤵️
You might have come across small glass tubes with three tiny ball bearings inside, often seen in antique tool collections. These aren’t random curiosities—they are precision parts from bullseye or machinist’s levels, also known as spirit levels. Unlike standard linear levels with a single bubble, bullseye levels use a circular, dome-shaped capsule filled with liquid…