Identifying Small Glass Tubes Containing Three Tiny Ball Bearings
You’ve likely found vials from a vintage or antique spirit level—also known as a “bullseye level” or machinist’s level. What It Is: Those small glass tubes containing three tiny ball bearings are not random curiosities—they’re precision components from an old spherical (bullseye) spirit level, commonly used in: Carpentry Masonry Machinery alignment Surveying equipment Unlike standard … Read more