Abstract
THE production of optical glass is one of the most difficult as well as one of the most interesting of manufacturing processes. Fraunhofer was the first to realize the necessity for improvement in the manufacture of glass in order to bring it to the necessary degree of homogeneity and to make it free from internal strain, essential requirements for optical glass. It may be said that it has taken more than a hundred and fifty years to bring the art of optical glass manufacture to its present state. Messrs. Chance Bros, have been engaged on the task for nearly a hundred and twenty years and the Chance-Parsons optical glass embodies their experience, together with the newer research work in their laboratories as well as that of the firm owned by the late Sir Charles Parsons, under whom notable advances were made.
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