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Résumé : Abstract In a 1954 paper (1) we presented various measures of the uncertainties of the data of precision steam-consumption tests on medium-sized steam turbine-generator sets, deriving them from the over-all results of the tests and from comparisons of duplicate instruments used in them. In the present paper we describe briefly the instruments and their calibrations, and we present typical calibration corrections. The instruments and their calibrations have been used for many years. Most comparisons presented here demonstrate that instruments of high precision have small calibration corrections which are significant and that most corrections do not change significantly. They also show that these instruments can be relied upon in very precise turbine steam-consumption tests.