Abstract
P. E. Jellyman and A. J. Milne have described in Nature of March 27, p. 477, a form of photo-elastic compensator using a plate of C.R.39 resin in which a uniform stress variation (produced by pure bending) is frozen. A more sensitive compensator (which also depends on the frozen stress in C.R.39 resin) has been in use for more than a year at the Royal Aircraft Establishment. This instrument works on the same principle as the Berek compensator, in which a thin crystal slice (calcite or quartz), cut normal to the optic axis, can be tilted at various angles to the light path, giving a relative retardation increasing with the angle of tilt.
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FISHER, W. A Large Field Compensator of the Berek Type. Nature 161, 848 (1948). https://doi.org/10.1038/161848a0
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DOI: https://doi.org/10.1038/161848a0
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