Abstract
BEFORE 1880 the only types of optical glass available to lens designers were the flint-crown series, in which the addition of progressively increasing amounts of lead oxide led to a progressive increase in both refractive index and dispersive power, so that in effect there was a fixed relation between the dispersive power and refractive index of all available glasses (Fig. 1).
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References
British Patent 462,304, March 3, 1937; United States re-issue Patent 21, 175, August 15, 1939.
United States Patents 2,206,081; 2,241,249; 2,434,146; 2,434,147; 2,434,148; 2,434,149. British Patents 462,304; 608,298.
United States Patent 2,425,403.
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KINGSLAKE, R., DePALOIS, P. New Optical Glasses. Nature 163, 412–413 (1949). https://doi.org/10.1038/163412a0
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DOI: https://doi.org/10.1038/163412a0