Abstract
WEDGES of tinted glass have been used for graduating light for experimental purposes during the last fifty years or so, and about five and twenty years ago Warnerke made annular wedges of pigmented gelatine. It is twenty years since the “Chapman Jones plate tester” was put on the market, the graduated portion of which is a pigmented gelatine wedge, the mould being cut into five pieces that are placed side bv side for the sake of convenience. Optical wedges, therefore, have been well established as standard apparatus for a long time.
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J., C. Optical Wedges. Nature 108, 550 (1921). https://doi.org/10.1038/108550a0
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DOI: https://doi.org/10.1038/108550a0