A new theory of optics : as regards refraction of dense media, and vision / by Alexander Watt, apothecary and druggist.
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A new theory of optics : as regards refraction of dense media, and vision / by Alexander Watt, apothecary and druggist. Credit: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.). Public Domain Mark