Abstract
THE application of fairly high pressures to fibre specimens on the microscope has been found to produce types of photoelastic stress patterns in cotton and nylon fibres. The method, which is modified from the original technique devised by Boddy1 and that due to Merton2, consists in applying a load to a lever system which exerts pressure on the condenser. The front lens of this is replaced with a sapphire sphere 1/16 in. or EquationSource math mrow mfrac mn1 mrow mn8 in. in diameter. This operates through the cover slip on the specimen. Thus light rays can be focused through the sphere and through the material while pressure is applied or released, and the behaviour of the fibres watched throughout the process.
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References
Boddy, R. G. H. B., Nature, 151, 54 (1943); Fuel, 22, 56 (1943).
Merton, Sir Thomas, Proc. Roy. Soc., A, 189 (May 1949).
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CRUISE, A. Photoelastic Effects in Microscopic Fibres. Nature 174, 923–924 (1954). https://doi.org/10.1038/174923b0
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DOI: https://doi.org/10.1038/174923b0
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