Abstract
FILMS of very strongly pleochroic material, usually mounted between glass plates, have been available during the past few years under the trade-name 'Polaroid'. For some purposes they can replace the nicol prism, but their use has been restricted because in a moderately strong light they transmit a noticeable reddish-violet colour at the position of extinction.
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HALLIMOND, A. Use of 'Polaroid' for the Microscope. Nature 154, 369–371 (1944). https://doi.org/10.1038/154369b0
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DOI: https://doi.org/10.1038/154369b0