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Additional ingredients may be added to color the glass. For example, an oxide of cobalt is used to make glass blue. [3] Broken and scrap glass, known as cullet, is often used as an ingredient to make new glass. The cullet melts faster than the other ingredients, which results in some savings in fuel cost for the furnace.
Glass was not pressed in the United States until the 1820s. [8] Until the 20th century, window glass production involved blowing a cylinder and flattening it. [9] Two major methods to make window glass, the crown method and the cylinder method, were used until the process was changed much later in the 1920s. [10]
Mechanical pressing of glass reduced the time and labor necessary to make glass products, which lowered costs and made glass products available to more of the public. [32] An 1884 U.S. government report considered mechanical pressing and a new formula for glass to be the two great advances in American glassmaking during the 19th century. [ 25 ]
J.S. O’Connor Rich Cut Glass has been described as one of the most extensive glass cutting factories in America with O’Connor recalled as one of the finest glass cutters in the nation. The factory was said to be one of a kind in America, run by waterpower and lit by electricity generated by its own electrical plant.
Batch processing is one of the initial steps of the glass-making process. The batch house simply houses the raw materials in large silos (fed by truck or railcar), and holds anywhere from 1–5 days of material. Some batch systems include material processing such as raw material screening/sieve, drying, or pre-heating (i.e. cullet). Whether ...
In 1793 the firm advertised a reward of $50 for identification of any nearby source of sand suitable for use as raw material in glass making. Also, "Clay for making crucibles and sand for making glass were brought to Albany from Amboy and Port Elizabeth, New Jersey." [5] In the year 1795, the Glass House was reorganized as McGregor & Co. [2]
“The light, with the glass, moves you to the core,” said Quagliata, an 81-year-old master of his craft, on a recent day at his studio in Valle de Bravo, near Mexico City. Over the last five ...
Glass globes for Benjamin Franklin's electrostatic machines were made by Wistarburg Glass Works. [17] Wistar's factory produced about 15,000 glass bottles per year made in the Waldglas style, which had been a way of making glass in Europe since the Middle Ages. It was an inexpensive traditional method whereby the main materials of wood ash and ...