Glassblowing is a glassforming technique that involves inflating molten glass into a bubble with the aid of a blowpipe. A person who blows glass is called a glassblower, glassmith, or gaffer. A lampworker manipulates glass with the use of a torch on a smaller scale, such as in producing precision laboratory glassware out of borosilicate glass.
Venetian glass is glassware made in Venice, typically on the island of Murano near the city. Traditionally it is made with a soda–lime "metal" and is typically elaborately decorated, with various "hot" glass-forming techniques, as well as gilding, enamel, or engraving. Production has been concentrated on the Venetian island of Murano since the 13th century. Today Murano is known for its art glass, but it has a long history of innovations in glassmaking in addition to its artistic fame—and was Europe's major center for luxury glass from the High Middle Ages to the Italian Renaissance. During the 15th century, Murano glassmakers created cristallo—which was almost transparent and considered the finest glass in the world. Murano glassmakers also developed a white-colored glass that looked like porcelain. They later became Europe's finest makers of mirrors.
A glass bottle is a bottle made from glass. Glass bottles can vary in size considerably, but are most commonly found in sizes ranging between about 200 millilitres and 1.5 litres. Common uses for glass bottles include food condiments, soda, liquor, cosmetics, pickling and preservatives; they are occasionally also notably used for the informal distribution of notes. These types of bottles are utilitarian and serve a purpose in commercial industries.
Cylinder blown sheet is a type of hand-blown window glass. It is created with a similar process to broad sheet, but with the use of larger cylinders. In this manufacturing process glass is blown into a cylindrical shape by a glass blower. The ends of the cylinder are cut off and a cut is made down the side of the cylinder. The cut cylinder is then placed in an oven where the cylinder unrolls into a flat glass sheet. Blenko Glass Company used this method to make flat glass during the 20th century, but it used a process patented by William Blenko that used molds for the cylinder to enable consistency in the size of the glass. In Blenko's case, slight imperfections were desired for the purpose of giving the flat glass the appearance of antique glass.
Blenko Glass Company, located in Milton, West Virginia, makes hand-blown glass.
In glassblowing, cane refers to rods of glass with color; these rods can be simple, containing a single color, or they can be complex and contain strands of one or several colors in pattern. Caneworking refers to the process of making cane, and also to the use of pieces of cane, lengthwise, in the blowing process to add intricate, often spiral, patterns and stripes to vessels or other blown glass objects. Cane is also used to make murrine, thin discs cut from the cane in cross-section that are also added to blown or hot-worked objects. A particular form of murrine glasswork is millefiori, in which many murrine with a flower-like or star-shaped cross-section are included in a blown glass piece.
Glass production involves two main methods – the float glass process that produces sheet glass, and glassblowing that produces bottles and other containers. It has been done in a variety of ways during the history of glass.
The Fostoria Glass Company was a manufacturer of pressed, blown and hand-molded glassware and tableware. It began operations in Fostoria, Ohio, on December 15, 1887, on land donated by the townspeople. The new company was formed by men from West Virginia who were experienced in the glassmaking business. They started their company in northwest Ohio to take advantage of newly discovered natural gas that was an ideal fuel for glassmaking. Numerous other businesses were also started in the area, and collectively they depleted the natural gas supply. Fuel shortages caused the company to move to Moundsville, West Virginia, in 1891.
A glossary of terms used in glass art
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 in the United States. The company was also known for its high-quality lead (crystal) stemware, which was hand-made for nearly a century. Customers included Eleanor Roosevelt and Lyndon B. Johnson, and retailers such as Marshall Field and Company, Neiman Marcus, and Tiffany's.
Early glassmaking in the United States began in Colonial America in 1608 at the Colony of Virginia near Jamestown, believed to be the first industrial facility in what would later become the United States. For centuries, glassmaking procedures, techniques, and recipes were kept secret, with countries actively preventing glassmaking knowledge from spreading beyond their borders. German workers with glassmaking knowledge, described as Dutchmen, along with Polish glass workers, were brought to Colonial America to begin operations. Although glass was made at Jamestown, production was soon suspended because of strife in the colony. A second attempt at Jamestown also failed.
J. H. Hobbs, Brockunier and Company was one of the largest and best-known manufacturers of glass in the United States during the 19th century. Its products were distributed worldwide. The company is responsible for one of the greatest innovations in American glassmaking—an improved formula for lime glass that enabled American glass manufacturers to produce high-quality glass at a lower cost. The firm also developed talented glassmakers that started glass factories in Ohio and Indiana.
Indiana Glass Company was an American company that manufactured pressed, blown and hand-molded glassware and tableware for almost 100 years. Predecessors to the company began operations in Dunkirk, Indiana, in 1896 and 1904, when East Central Indiana experienced the Indiana gas boom. The company started in 1907, when a group of investors led by Frank W. Merry formed a company to buy the Dunkirk glass plant that belonged to the bankrupt National Glass Company. National Glass was a trust for glass tableware that originally owned 19 glass factories including the plant in Dunkirk. National Glass went bankrupt in 1907, and its assets were sold in late 1908.
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 formulas for various colors of glass, and he is the discoverer of the American formula for selenium-based ruby glass. The company's products were very popular, and it was able to make significant profits early in its existence. In addition to lamps and shades for home lighting, the company also made novelties such as salt shakers.
Mambourg Glass Company was a window glass manufacturer that began production on October 26, 1887. The company was the first of thirteen glass manufacturers located in Fostoria, Ohio, in the United States, during northwest Ohio's gas boom. The plant was managed by Leopold Mambourg, a Belgian immigrant and experienced glassmaker. Much of the company's work force was also from Belgium. Former Ohio governor Charles Foster was president of the company and a major financial backer. He was also a major investor in other businesses and two additional Fostoria window glass companies: the Calcine Glass Company and the Crocker Glass Company. Mambourg was the chief operating officer for all three of Foster's window glass companies.
18th century glassmaking in the United States began before the country existed. During the previous century, several attempts were made to produce glass, but none were long-lived. By 1700, it is thought that little or no glass was being produced in the British colonies that would eventually become the United States. The first American glass factory operated with long–term success was started by Caspar Wistar in 1745—although two glass works in New Amsterdam that operated in the previous century deserve honorable mention. Wistar's glass works was located in the English colony known as the Province of New Jersey. In the southeastern portion of the Province of Pennsylvania, Henry Stiegel was the first American producer of high–quality glassware known as crystal. Stiegel's first glass works began in 1763, and his better quality glassmaking began in 1769. In the United States, the first use of coal as a fuel for glassmaking furnaces is believed to have started in 1794 at a short-lived factory on the Schuylkill River near Philadelphia. In 1797 Pittsburgh's O'Hara and Craig glass works was also powered by coal, and it contributed to the eventual establishment of Pittsburgh as a leading glassmaking center in the 19th century.
Indigo Blue Seaform with Red Lip Wraps is a blown glass sculpture by Dale Chihuly. It was completed in 1997 and is currently located in Central Library at Vanderbilt University in Nashville, Tennessee. The glass features striations, swirls, and a translucency that mimics the natural beauty of underwater environments.
Very few 19th Century glassmaking innovations in the United States happened at the beginning of the century. Only ten glass manufacturers are thought to have been operating in 1800. High-quality glassware was imported from England, and glassmaking knowledge was kept secret. England controlled a key ingredient for producing high–quality glassware and kept its price high—making it difficult for American glass manufacturers to compete price-wise. European glassmakers with the knowledge to produce high–quality glassware were, in some cases, smuggled to the United States. Eventually the American glass industry grew, and the second half of the century saw numerous innovations.
19th century glass categories in the United States include types of glass and decoration methods for glass. A simplified category version appropriate at the beginning of the century is glassware, bottles, and windows. As the century progressed, glass production became more complex and made necessary more categories and subcategories. An 1884 United States government report used glassware, bottles, windows, and plate glass as major categories—although plate glass accounted for only four percent of the value of all glass made.
19th century glassmaking in the United States started slowly with less than a dozen glass factories operating. Much of the nation's better quality glass was imported, and English glassmakers had a monopoly on major ingredients for high–quality glass such as good–quality sand and red lead. A tariff and the War of 1812 added to the difficulties of making crystal glass in America. After the war, English glassmakers began dumping low priced glassware in the United States, which caused some glass works to go out of business. A protective tariff and the ingenuity of Boston businessman Deming Jarves helped revive the domestic glass industry.
Glassblower shapes orange-hot glass
Glassware is detached from blow pipe for more shaping
Glassware is reheated in oven for more work
Reheated glassware with additional shaping is trimmed
