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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.
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.
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]
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 ...
Craftspeople work alongside each other, fire wood and gas fired kilns, blow glass and make a living as artists onsite. Cedar Creek Pottery and Gallery was started in 1968 by Sid and Pat Oakley on what used to be an old tobacco field. [1] The Gallery has grown from one building into over ten since then. [2]
Machine drawn window glass: John H. Lubbers created a glass blowing machine. Experiments began in 1896. [59] The machine withdrew the molten glass and blew a cylinder as the first step in Cylinder method for making window glass—replacing the task of highly skilled and highly-paid glassblowers. [60]
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