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 linear spirit levels (with one …
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