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The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index n d at the Fraunhofer d- (or D 3-) line, 589.3 nm, and its Abbe number V d also taken at that line.
Another type of mark is found on glass baskets. Where the glass handles of the baskets are attached to the base of the basket a stamp is made. [9] Each handler had a specific pattern to help identify which handler attached the handle. [9] The marks began in the 1950s and were instituted by Frank M. and Bill Fenton. [9]
The second mark, which is the more commonly known by collectors and dealers, is the intertwined W and G that Westmoreland began to use in 1946 on most of the glassware. [8] In 1981, David Grossman bought the factory from the Brainard family and changed the mark. The new mark was the word Westmoreland in a circle around three lines. [8]
Northwood mark on a vase. The most common Northwood maker mark was an underlined capital N centered inside of a circle. [13] [14] Not all pieces carry the mark but it is seen most often on carnival glass items. L.G. Wright also used a mark like it, but was forced to stop using it. [13]
Pages in category "Glass trademarks and brands" The following 47 pages are in this category, out of 47 total. This list may not reflect recent changes. A. AGC Inc.
The great majority of the company's production was in the form of glass bottles many of which were beer bottles, milk bottles, and many glass medicine bottles in a variety of standard sizes. Bottle collectors identify the company's products through the mould numbers and distinctive letter-in-a-keystone mark on the base of the bottles. [2] [3]
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The average number of employees for this segment of glass manufacturers was 173, and the average annual value of output per plant was $131,076. [70] While 1880 statistics are not readily available for J. H. Hobbs, Brockunier and Company, an 1879 article (as stated earlier) mentioned it had 350 employees and revenue of $300,000. One of the best ...