Rectangular perforated rule for verifying flatness of surface and measuring thickness of comparator, has arm formed in sphere, sector coinciding with sphere, axis inserted in clock, and magnet inserted inside perforations located in groove

摘要

The rule (1) has a longitudinal groove (1.2) to receive a clock comparator (2) with an arm (2.1) formed in a sphere (2.2) in a cleared end. A sector coincides with the sphere. An axis is inserted in a sliding clock. A magnet is inserted inside perforations located in a groove.