Abstract
Measurements have been made at four European national metrology institutes (NMIs) in the subject field of angle measurement. Specifically, each NMI made measurements of two precision polygons: a six-sided polygon made of glass with aluminium-coated faces and a twelve-sided polygon, made of steel. Each participant used a different device to rotate the polygons. Among the participants, three different models of autocollimator were used to measure the deviation from nominal angle (two participants used the same model). The report lists the results obtained by the individual participants, as well as an analysis of the results and their uncertainties, based on calculation of the weighted means and En values. The results are in good agreement with one another.Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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