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  2. Lehr (glassmaking) - Wikipedia

    en.wikipedia.org/wiki/Lehr_(glassmaking)

    Inspector at the cool end of a lehr. 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.

  3. Warm glass - Wikipedia

    en.wikipedia.org/wiki/Warm_glass

    Higgins Glass, fused and slumped ashtray and bowl Fused glass piece with dichroic glass highlights. Warm glass or kiln-formed glass is the working of glass, usually for artistic purposes, by heating it in a kiln. The processes used depend on the temperature reached and range from fusing and slumping to casting.

  4. Annealing (glass) - Wikipedia

    en.wikipedia.org/wiki/Annealing_(glass)

    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]

  5. 19th century glassmaking in the United States - Wikipedia

    en.wikipedia.org/wiki/19th_century_glassmaking...

    The National Glass Company controlled 19 glass companies, which meant it controlled about 75 percent of the glass tableware market in the United States. [106] The American Window Glass Company trust was created in 1898, and it had over half of the nation's window glassmaking capacity in part because it consisted of many of the large works that ...

  6. Glass casting - Wikipedia

    en.wikipedia.org/wiki/Glass_casting

    Glass casting is the process in which glass objects are cast by directing molten glass into a mould where it solidifies. The technique has been used since the 15th century BCE in both Ancient Egypt and Mesopotamia. Modern cast glass is formed by a variety of processes such as kiln casting or casting into sand, graphite or metal moulds.

  7. Glassblowing - Wikipedia

    en.wikipedia.org/wiki/Glassblowing

    A stage in the manufacture of a Bristol blue glass ship's decanter.The blowpipe is being held in the glassblower's left hand. The glass is glowing yellow. As a novel glass forming technique created in the middle of the 1st century BC, glassblowing exploited a working property of glass that was previously unknown to glassworkers; inflation, which is the expansion of a molten blob of glass by ...

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