Abstract
1. The determination of the variance of a series of measuring instrument readings is possible not only with constant external conditions but also in the presence of a systematic error. 2. The method here developed provides the determination of the variance of instrument readings in the presence of a systematic progressive linear error. 3. The determination of the variance by this method is possible both by calculation and graphically. 4. The definition of the term “variance” adopted in metrology is a particular case of the general variation in which the readings are affected by a systematic error.
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