How Are Stained Glass Windows Made

Stained Drinking glass

Groundwork

The engineering for making glass dates dorsum at to the lowest degree v,000 years, and some class of stained drinking glass was used in European Christian churches by the third or fourth century A.D. The art of stained glass flowered in the 12th century with the rise of the Gothic cathedral. Today only ten% of all stained glasses are used in churches and other religious buildings; the residual are used in residential and industrial compages. Though stained drinking glass has traditionally been used in windows, its utilize has expanded to lamp shades, Christmas ornaments, and fifty-fifty uncomplicated objects a hobbyist can make.

Stained glass has had various levels of popularity throughout history. The 12th and 13th centuries in Europe have been designated as the Gold Age of Stained Drinking glass. Nonetheless, during the Renaissance menses, stained glass was replaced with painted drinking glass, and by the 18th century it was rarely, if ever, used or made according to medieval methods. During the second half of the 19th century, European artists rediscovered how to design and work glass according to medieval principles, and big quantities of stained glass windows were made.

In America, the stained drinking glass move began with William Jay Bolton, who made his first window for a church in New York in 1843. Only he was to be in the business organization for only six or 7 years earlier returning to his native England. No other American good the art professionally until Louis Comfort Tiffany and John La Farge began working with stained drinking glass nigh the stop of the 19th century. In fact, the art of stained drinking glass in the Us languished until the 1870s, and did not undergo a true revival until the plow of the century. At this time, American architects and glassmen journeyed to Europe to study medieval drinking glass windows, returning to create similar art forms and new designs in their own studios.

A leaded stained glass window or other object is made of pieces of glass, held together past lead. The pieces of glass are nearly 1/eight-inch (3.2 mm) thick and bound together past strips, chosen "cames" of grooved lead, soldered at the joints. The unabridged window is secured in the opening at regular intervals past metal saddle bars tied with wire and soldered to the leads and reinforced at greater intervals past tee-confined fitted into the masonry. A faceted glass panel differs slightly from traditional leaded stained glass in that information technology is made up of pieces of slab (dalle) glass approximately 8 inches square, or in large rectangular sizes, varying in thickness from one-two inches (2.5-v cm). These slabs are not held together with pb; rather they are embedded in a matrix of physical, epoxy, or plastic.

Raw Materials

Glass is fabricated by fusing together some form of silica such equally sand, an alkali such as potash or soda, and lime or pb oxide. The color is produced by adding a metallic oxide to the raw materials.

Copper oxide, nether dissimilar conditions, produces cherry, blue, or dark-green colors in glass. Cobalt is usually used to produce virtually shades of blues. Light-green shades can too be obtained from the addition of chromium and iron oxide. Golden glass is sometimes colored with uranium, cadmium sulfide, or titanium, and at that place are fine selenium yellows as well as vermilions. Crimson colored drinking glass is made by adding aureate.

The Manufacturing
Process

Stained glass is withal made the same fashion it was back in the Center Ages and comes in various forms. For the drinking glass used in leaded glass windows, a lump of the molten glass is caught up at 1 finish of a accident pipe, blown into a cylinder, cut, flattened and cooled. Artisans also vary this basic procedure in society to produce different effects. For example, "flashed glass" is made by dipping a ball of molten white glass into molten colored drinking glass which, when blown and flattened, results in a less intense color considering it volition exist white on one side and colored on the other.

So-called "Norman slabs" are made by bravado the molten glass into a mold in the shape of a four-sided bottle. The sides are cut apart and class slabs, thin at the edges and as much as 0.25 inch (0.6 cm) thik) at the centre. Another form of drinking glass, known as cathedral glass, is rolled into apartment sheets. This results in a somewhat monotonous regularity of texture and thickness. Other similarly fabricated spectacles are referred to as marine antique, only have a more bubbly texture.

Processing the stained glass

• 1 Large manufacturers of stained glass mix the batch of raw materials, including alkaline fluxes and stabilizing agents, in huge mixers. The mix is then melted in a mod furnace at 2500°F (1371°C). Each ingredient must be carefully measured and weighed according to a calculated formula, in society to produce the advisable color. For cathedral glass, the molten glass is ladled into a machine that rolls the glass into 1/viii-inch (iii.ii

  

  mm) thick sheets. The sheets are then cooled in a special furnace chosen an annealing lehr. The glass is then inspected, trimmed to standard size, and packed into cases.

  At a typical manufactory, eight to ten unlike color runs are made per twenty-four hours. Some manufacturers cut a small-scale rectangle of drinking glass from each run in order to provide a sample of each color to their customers. At that place are hundreds of colors, tints, and patterns available, too as a number of different textures of cathedral drinking glass. Different textures are produced by irresolute the roller to ane having the desired texture. Glass manufacturers are continuously introducing new colors and types of drinking glass to meet the demands of their customers.

Creating the window blueprint

• two Though some of the tools to make stained glass windows have been improved, the windows are still hand crafted equally they were centuries ago. The offset step of the process involves the artist creating a small scale version of the final pattern. Afterward the design has been approved, the craftsperson takes measurements or templates of the actual window openings to create a design. This pattern is normally drawn on newspaper or cardboard and is the actual size of the spaces to exist filled with glass.

  Next a total-sized drawing called the cartoon is prepared in blackness and white. From the cartoon, the cutline and pattern drawings are

  

  made. The modern cutline cartoon is a conscientious, exact tracing of the leadlines of the cartoon on heavy newspaper. The leadlines are the outlines of the shapes for patterns to which the glass is to exist cut. This drawing serves as the guide for the subsequent placing and binding with pb of the many pieces of glass.

  The pattern-drawing is a carbon copy of the cutline cartoon. It is cut forth the black or atomic number 82 lines with double-bladed pair of scissors or a knife which, equally it passes through the middle of the black lines, simultaneously cuts abroad a narrow strip of newspaper, thus allowing sufficient space betwixt the segment of glass for the core of the grooved atomic number 82. This core is the supporting wall between the upper and lower flanges of the lead.

Cutting and painting

• 3 Colored glass is and then selected from the supply on hand. The design is placed on a slice of the desired color, and with a diamond or steel wheel, the drinking glass is cut to the shape of the pattern. After the glass has been cutting, the main outlines of the cartoon are painted on each piece of glass with special paint, called "vitrifiable" paint. This becomes burnished when heated. The painter might apply further paint to the glass in order to command the light and bring all the colors into closer harmony. During this painting process, the glass is held up to the low-cal to simulate the aforementioned conditions in which the window will be seen. The painted pieces are fired in the kiln at to the lowest degree once to fuse the paint and glass.

Glazing and leading

• four The next pace is glazing. The cutline cartoon is spread out on a table and narrow strips of wood called laths are nailed down forth two edges of the drawing to form a correct bending. Long strips of grooved lead are placed along the inside of the laths. The slice of glass belonging in the angle is fitted into the grooves. A strip of narrow lead is fitted around the exposed edge or edges and the next required segment slipped into the groove on the other side of the narrow pb. This is continued until each piece has been inserted into the leads in its proper identify according to the outline drawing beneath.

Finishing

• 5 The many joints formed past the leading are then soldered on both sides and the unabridged window is waterproofed. Afterward the completed window has been thoroughly inspected in the light, the sections are packed and shipped to their destination where they are installed and secured with reinforcing bars.

Faceted drinking glass

• half-dozen For faceted glass windows, the process begins the same mode, with the cutline and pattern drawings being made with carbons in a similar manner. The pattern cartoon is then cut to the actual size of the piece of drinking glass with ordinary scissors since there is no cadre of pb to allow for. The thick glass slabs adjacent are cut with a sharp double-edged hammer to the shape of the pattern. To give the slab an interesting texture, the worker then chips round depressions in the glass with the same hammer. This is called faceting.

  Instead of glazing with pb, a matrix of concrete or epoxy is poured around the pieces of drinking glass. The glass pieces have get-go been glued to the outline drawing, which is covered with a heavy coating of transparent grease so that the newspaper can be removed after the epoxy sets. The whole is enclosed within a wooden class, which is the exact size and shape of the section being made. The worker must vesture gloves during this process, since epoxy resin is a toxic material. Later hardening, the department is cleaned and cured prior to shipping and installation.

  The process for making an entire stained glass window tin can accept anywhere from seven to ten weeks, since everything must be done past manus. Cost can vary widely depending on complexity and size, though some windows can be created for a cost as low as $500. The customer tin choose an existing pattern rather than create an entirely new one to minimize costs. In this case, the blueprint tin be customized by altering shapes or past changing the placement of the central image.

The Future

In the final xx years there has been an explosion in growth of glass studios in the United States and it appears this growth will continue. For instance, in Ohio lonely the number of studios has increased from a mere half a dozen to at least 100. The Stained Glass Association of America membership includes 500 studio owners and 300 manufacturers. The circulation of its quarterly publication totals half dozen,000. There has been a resurgence in restoration overseas, and the domicile market continues to grow. The hobby market place also appears stiff, with one publication serving this marketplace having a circulation of 15,000. Information technology is clear that stained drinking glass is now recognized as a true art form no matter where information technology is used, and innovative designs using this medium will continue to flourish.

Where To Larn More than

Books

Clark, Willene B. The Stained Glass Fine art of William Jay Bolton. Syracuse Academy Press, 1992.

Clarke, Brian, ed. Architectural Stained Glass. McGraw-Hill, 1979.

Plowright, Terrance. Stained Drinking glass Inspirations and Designs. Kangaroo Printing, Commonwealth of australia, distributed by Seven Hills Volume Distributors, 1993.

Other

Achilees, Rolf and Neal A. Vogel. Stained Glass in Houses of Worship. Inspired Partnerships Inc. and the National Trust for Historic Preservation, 1785 Massachusetts Avenue NW, Washington, DC 20036.

The Story of Stained Glass, 1984. The Stained Glass Association of America, PO Box 22642, Kansas City, MO 64113. 800-888-7422,816-333-6690.

— Laurel Grand. Sheppard

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