Snodgrass Glass Supply

The Dragon's Glassory:

A glossary of glass terms.

Alphabetical Index

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Obsidian:

  • Native Volcanic Glass.

Oenocheo

  • Greek
  • An ovoid jug with large loop handle and flat bases and often a trefoil lip for pouring.

Off Hand Glass:

  • US, see frigger.
  • Hand made glass, often other than normal production work, such as done for pleasure.

Off Hand Glass Blowing:

  • The gathering and working of a gob of hot glass on the end of a hllow metal tube or rod.

Ogival:

O'Hara (Pittsburgh) Glass:

  • The O'Hara Works was the name used for several factories consolidated by the Lyon interest at Pittsburgh during the 1870s.
  • Production included:
  1. cut glass
  2. engraved wares
  3. fine blown wares
  4. fine pressed wares
  5. gilded glass
  6. specialties

Ohio Glass:

  • Reference to glass made at one of the many Ohio glass plants.

Opal Glass:

  • A dense white glass with impressed over all with floral pattern.
  • Dishes have a looped openwork rims or borders.
  • The ribbed and banded patterns have panels and floral medallions.

Opalescent Glass:

  • Glass the has a milky iridescence like an opal created by William Barr of Steubenville, Ohio, c. 1888.

Opalescent Rib:

  • Pressed glass pattern with vertical ribs, swirled or plain, of opal or bluish opal glass.

Opaline:

  • A book shaped or rectangular paperweigh of opaqe or transparent opaline glass that has a somewhat raised nosegay, oval medallion or milleifiori patterns inside.
  • A Clichy line of work.

Opaque:

  • Not transparent or translucent, but impenetrable by light.

Opaque twist:

  • Also known as the cotton twist in US
  • The use of opaque white and other colored rods that are twisted and patterned, then drawn into thin, workable rods for decorative work.

Opaque White:

Openwork:

  • Reference to the edges or rims of glass with an openwork patter of loops, swirls, and swags after the style of nineteenth century porcelain. Generally it was pressed in milk white glass, and often dates after 1865.

Optic Mold:

  • A upside-down cone shaped mold with internal ribs to form glass. Optics are usually made of aluminum, brass or bronze and come numerous shape and sizes.

Optical Glass:

  • Used in microscopes and cameras, is prepared more carefully than any other glass. It must be free of bubbles, ripples, or streaks. The two main classes of optical glass are crown glass, which has low refraction and dispersion, and flint glass, which has high refraction and dispersion.

Orrefors.

  • Phenomenal 20th-century glass made in Orrefors, Sweden. It is characterized by uncomplicated decoration yet careful interest to engraving detail. The glass can give the observer a feeling of looking at liquid caught in glass. Ariel glass has air bubbles making designs in blankets of colored or uncolored glass. From 1915 to 1917 the painters Simon Gate and Edward Hald developed the Graal process. Colored decorations, in relief, are encased in a coat of colorless, transparent, crystal to make a smooth surface.

OSHA:

  • Occupation Safety and Health Administration.
  • The government agency that establish guidlines for work place safety, such as: safe handling of hazardous materials, and fsafety equipment.

Oval Miter:

  • Pressed glass pattern in the Ashburton tradition with a series of pointed ovoid forms

Overglaze:

  • A material made with finely ground glass and applied to a prefused surface of glass, preventing devitrification and making a very glassy finish.

Overblow:

  • The small part of the paraison, that remains between the mold and the blow pipe. It is usually removed after annealing by cracking off.

Overlay:

  • The outer edge of cased glass.
  • The method of applying one color over another.

Overlay Glass:

  • Often an acronym for cased glass.
  • A cased glass of layers of different colors that have been cut to expose the layers of colors.
  • Double overlay has two outer layers of different colors.

Overlay Imitation:

  • A novelty glass that possibly dates from the 1870s, that used a resist form of blowing and treating glass to create an overlay effect.

Overlay Lamps:

  • The lamps, with true overlay, were made from the 1850s with many dating from 1860, and burned kerosene or coal oil..

Overlay Paperweights:

  • Paperweights coated with one to three layers of colored glass that have been cut with windows to view the inner design.

Overlaying:

  • The creation of two or more fused layers of different colored glass by one of three methods:
  1. Casing: cup overlay method.
  2. Flashing: dip overlay method.
  3. Casting: flat production, such as cameos.

Overglaze:

  • Finely ground glass, applied as a powder or suspension, of particular composition and applied to pre-fused surfaces. This avoids devitrification and a glassy surface.

Overshot:

  • Reference to glassware novelty art ware, made at Sandwich, with icy sharp crystalline finish.

Oxide:

  • Compounds of elements combined with oxygen. Several oxides are important in the production of glass.
  • Silicon
  • Sodium
  • Potassium
  • Calcium
  • Lead

Oxidizing:

  • An oxidizing flame is high in oxygen and is usually hotter and more defined than a reducing flame.

 

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