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Continuous Perfection: Optical-Quality Glass

They make glass. By day and night, the fires burn on … and bid the sand let in the light.      — Carl Sandburg, In Reckless Ecstasy, 1904. To see the unseeable: the quest is unending. But lenses and prisms are only as good as their glass. Optical-quality glass must be flawless. Even tiny flecks,