A new apparatus for testing bubble vials

In spite of the appearance of new measurement methods in geodetic survey, the importance of the bubble level has not decreased. The increase of accuracy is one of the most important tasks of geodetic research. In this connection, the reliability of the testing of high-precision bubble levels must also be increased. This purpose is served by an apparatus for testing bubble vials which fulfills up-to-date demands. The smallest measurable rotation angle is 0.1 second of arc, the smallest measurable displacement 0.01 mm. The values can be digitized.