The procedure for calibrating the CSIRO Fiber Fineness Distribution Analyzer in such a way as to bring its read nes into conformity with internationally accepted wool fiber diameter standards is descried using two wool tops measured by projection mieroscope as reference standard material.

A number of factors affecting measurements taken with the CSIRO Fiber Fineness Distribution Analyser are described.These factors influence the choice of conditions under which calibration and measurements are carried out. '

CSIRO has developed a Fiber Fineness Distribution Analyser that is capable of measuring 2000 fibers at the rate of 50 raw counts per second—a rate that permits up to 20 samples to be measured per hour. It will determine the distribution of diameter of the fibers and provides data for standard deviation and coeflicient of variation. The paper describes an investigation into the performance of the instrument, its calibration, and how results obtained from it are analyzed. ABSTRACT A number of combinations of staining and embedding procedures have been investigated to determine which are the most suitable for TEM studies of oxidatively shrinkproofed wool fibers. The site of attack on the wool fibers by the KMnO 4 /salt shrinkproofing treatment, as applied in the laboratory, was found to be the scale tips. The histochemistry of the various staining reactions is discussed.

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