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SYNOPSIS Non‐uniformity in thickness of thin sections of wool fibres has been observed and shown to be associated with the histological structure. In the case of natural and supercontracted fibres the non‐uniformity is probably caused by shrinkage of the specimen when subjected to vacuum; in the case of wool fibres containing acrylonitrile that has been polymerized in situ it is thought to be caused by deformation effects during cutting. Any contribution from the effects of electron bombardment in vacuo is negligible.
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M. W. Andrews (1965) studied this question.
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