Abstract
The readings comprising the measurement of fiber diameter on two tops by the projection micro scope were perturbed by moving one-quarter of the readings in each histogram element to the element next below and one-quarter to the element next above, thus simulating random error of observation. It is shown that the resulting increase in between-fiber variance may be neglected. It is further shown that, in the CSIRO Fiber Fineness Distribution Analyser, which is in effect an automatic projection- microscope method, the variance observed between mean diameters is greater than can be accounted for by the observed between-fiber variance, which in turn is greater than can be accounted for by random error of observation, thus implying a source of systematic error in the measurement of between- fiber variance.
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