Have you ever come across a small glass tube containing tiny metal balls and wondered what it was used for?
At first, the object can look like a strange piece of laboratory equipment or an unfinished mechanical part. In many cases, however, these small components are connected to an older type of leveling instrument used in precision work.
The design is a fascinating example of how engineers once relied on simple materials, gravity, and careful craftsmanship to achieve accurate measurements.
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