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Spin casting is a technique for constructing large parabolic mirrors by using the curved surface formed by a rotating liquid (e.g. in a rotating furnace). [1] It is distinct from the spin casting or centrifugal rubber mold casting (CRMC) technique used for casting metal or plastics.
Glass mirrors with superior reflectivity began to be made in the Roman Empire in the 1st century CE, but remained very expensive for a long time, as well as easy to break, and initially hardly any more reflective, [7] so that bronze mirrors remained common in many parts of the world until the 19th century.
Claude Lorrain mirror in shark skin case. A Claude glass (or black mirror) is a small mirror, slightly convex in shape, with its surface tinted a dark colour. Bound up like a pocket-book or in a carrying case, Claude glasses were used by artists, travelers and connoisseurs of landscape and landscape painting.
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One major expense for glass factories is fuel for the furnace, and this often determined the location of the glass works. [15] Glassmakers originally used wood for fuel in Colonial America. Coal first began being used in the 1770s. [16] Alternative fuels such as natural gas and oil were not used in the United States until 1875. [17]
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