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How to Identify Glassware Perhaps the first thing to know is that it is difficult to discern what kind of glass a piece is, according to Robinson, because glass has been produced in so many ...
Pontil scar on the base of a free-blown glass bowl. A pontil mark or punt mark is the scar where the pontil, punty or punt was broken from a work of blown glass.The presence of such a scar indicates that a glass bottle or bowl was blown freehand, while the absence of a punt mark suggests either that the mark has been obliterated or that the work was mold-blown.
The Westmoreland Glass Company was founded in 1889 when a group of men purchased the Specialty Glass Company located in East Liverpool, Ohio, and moved it to Grapeville, Pennsylvania. [1] Grapeville was chosen as the location of the factory because the property had a large source of natural gas. George West served as president of the company ...
The resulting glass code is the value of n d − 1 rounded to three digits, followed by V d rounded to three digits, with all decimal points ignored. For example, BK7 has n d = 1.5168 and V d = 64.17, giving a six-digit glass code of 517642. [1] Consequently, a linear approximation for the refractive index dispersion close that wavelength is ...
Other glass held in regard by collectors are adjacent colors of glass such as clambroth green. 20th century glassmakers such as New Martinsville, Fenton, Stueben, and Jobling (England) produced items that are also sought after by jadeite collectors, and are considered part of the overall “family” of colored glassware by collectors.
Harry Northwood c. 1912 Northwood glass works in West Virginia, October 1908. Harry Northwood who founded the company was the son of John Northwood, a noted maker of English cameo glass. [1] He came to America in 1880 and worked at J. H. Hobbs, Brockunier and Company. [1] He worked as a glass etcher there from approximately 1881-1884. [2]
Opaline glass is a style of antique glassware that was produced in Europe, particularly 19th-century France. It was originally made by adding materials such as bone ash to lead-crystal, creating a semi-opaque glass with reddish opalescence .
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