Abstract
SEVERAL variable phase-contrast systems have been described. Most of these make use of polarized light in order to obtain variation of phase or amplitude, or both1. An experimental microscope has been constructed by Messrs. Cooke, Troughton and Simms, Ltd., which allows the operator to obtain positive or negative phase-contrast at will, and to control the intensity of either the direct or diffracted light. A 'Soleil' compensator enables retardations ranging from + λ/4 to — λ/4 to be introduced. A full description of this instrument2, together with an account of the work carried out with it in this laboratory, will appear shortly3.
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References
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BARER, R. Variable Colour-Amplitude Phase-Contrast Microscopy. Nature 164, 1087–1088 (1949). https://doi.org/10.1038/1641087b0
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DOI: https://doi.org/10.1038/1641087b0
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