Search Results for: Optical instruments
stabilizer; and cullet (waste glass) to assist in melting the mixture. the properties of glass are varied by adding other substances, commonly in the form of oxides, e.g., lead, for brilliance and weight; boron, for thermal and electrical resistance; barium, to increase the refractive index, as in optical
punty) attached to the base of the vessel, and the lip is shaped and smoothed. methods of decoration include cutting, copper-wheel engraving, etching with hydrofluoric acid, enameling, gilding, and painting. glass has become invaluable in modern architecture, illumination, electrical transmission, instruments...
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