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Annealing is a process of slowly cooling hot glass objects after they have been formed, to relieve residual internal stresses introduced during manufacture. Especially for smaller, simpler objects, annealing may be incidental to the process of manufacture, but in larger or more complex products it commonly demands a special process of annealing in a temperature-controlled kiln known as a lehr. [1]
250 (1898) Seneca Glass Company was a glass manufacturer that began in Fostoria, Ohio, in 1891. At one time it was the largest manufacturer of blown tumblers (drinking glasses) in the United States. The company was also known for its high-quality lead (crystal) stemware, which was hand-made for nearly a century.
The glassworks operated sporadically beginning in the 1775–1776 winter, and was offered for sale in 1780. Richard Wistar died in 1781. The glass works was eventually closed and abandoned. [37] Wistar began the German domination of American glassmaking that continued until the 19th century. [39]
Lehr (glassmaking) In the manufacture of float glass, a lehr oven is a long kiln with an end-to-end temperature gradient, which is used for annealing newly made glass objects that are transported through the temperature gradient either on rollers or on a conveyor belt. The annealing renders glass into a stronger material with fewer internal ...
The glass floats on the tin, and levels out as it spreads along the bath, giving a smooth face to both sides. The glass cools and slowly solidifies as it travels over the molten tin and leaves the tin bath in a continuous ribbon. The glass is then annealed by cooling in an oven called a lehr. The finished product has near-perfect parallel surfaces.
The Fostoria Shade and Lamp Company was the largest manufacturer of glass lamps in the United States during the early 1890s. It began operations in Fostoria, Ohio, on May 17, 1890. The plant was run by Nicholas Kopp Jr., a former chemist at Hobbs, Brockunier and Company in West Virginia. Kopp achieved fame for his many glass designs and ...
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