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Stiegel's glass works in the Province of Pennsylvania was the first in America to make fine lead crystal, which is often mislabeled as flint glass. [64] Amelung invested more money in glassmaking than anyone ever had and produced impressive quality glass with engraving—although his Maryland glass works failed after 11 years. [65]
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.
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 ]
Early American molded glass refers to glass functional and decorative objects, such as bottles and dishware, that were manufactured in the United States in the 19th century. The objects were produced by blowing molten glass into a mold, thereby causing the glass to assume the shape and pattern design of the mold.
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]
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.
Two large stained-glass windows installed by Hartford City Glass Company's Belgian glass workers A New England Glass Company ewer , 1840–1860 A Novelty Glass Company advertisement in 1891 An electrical insulator made by Whitall Tatum Company , circa 1922
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 ...