Abstract
THE communication1 by Messrs. Hampton, Bastick and Wheat is timely in that it directs attention to recently developed forms of optical glass that depart markedly in properties from those previously available and so provide optical designers with increased scope. Two statements, however, need correction. The refractive index limits of the new Kodak glass2 are 1·71–2·02 and not 1·71–1·97, as stated; while the reference to the Kodak glass (known as EK2), having nD = 1·745 and V = 45·8, should not be taken to imply that it is now generally available. This glass is being made in England in our laboratories under the ægis of the Government and can be supplied for war purposes only.
References
NATURE, 153, 283 (1944).
B.P. 462,304 and B.P. 534,680.
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BENT, W. New Types of Optical Glass. Nature 153, 559 (1944). https://doi.org/10.1038/153559a0
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DOI: https://doi.org/10.1038/153559a0
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