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Accurate measurements of the temperature profiles in the rotor windings of 11 large turbine generators have been made during factory tests over the past 3 years. Up to 77 rotor thermocouples have been read through instrument slip rings during heat runs at loadings up to full-load field current. A new method to load the rotor during factory tests has been employed. Local temperature measurements are particularly important to the orderly development of highly rated conductor-cooled fields.