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Glass beads composed of soda lime glass are essential for providing retroreflectivity in many kinds of road surface markings. [1] Retroreflectivity occurs when incident light from vehicles is refracted within glass beads that are imbedded in road surface markings and then reflected back into the driver's field of view. [ 2 ]
The term Kiffa bead, named after one of the old bead making centres of Kiffa in Mauritania, was coined by United States bead collectors during the 1980s. According to Peter Francis, Jr., the making of powder glass beads in West Africa may date back a few hundred years, and to possibly 1200 CE in Mauritania.
Venetian chevron beads are drawn beads, made from glass canes, which are shaped using specifically constructed star moulds. The first chevron beads were made towards the end of the 15th century, consisting of 7 layers of alternating colours. They usually have 6 facets. Unlike their later counterparts, they were not always made with the standard ...
A selection of glass beads Merovingian bead Trade beads, 18th century Trade beads, 18th century. A bead is a small, decorative object that is formed in a variety of shapes and sizes of a material such as stone, bone, shell, glass, plastic, wood, or pearl and with a small hole for threading or stringing.
Lampworking-closeup Lampwork glass beads. Glass bead making has long traditions, with the oldest known beads dating over 3,000 years. [1] [2] Glass beads have been dated back to at least Roman times. Perhaps the earliest glass-like beads were Egyptian faience beads, a form of clay bead with a self-forming vitreous coating. Glass beads are ...
Highest listing price on eBay: $750. Hazel Atlas Blue Royal Lace stands out among Depression glass patterns, prized for its intricate design and vibrant cobalt blue hue. Produced between 1934 and ...
Just Words. If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online! By Masque Publishing
526 ± 27 [3] [4] [5] 395 [6] Coefficient of thermal expansion, ppm/K, ~100–300 °C 9 3.5 10 7 0.55 7.3 Density at 20 °C, [g/cm 3], x1000 to get [kg/m 3] 2.52 2.235 2.550 3.86 2.203 3.65 [7] 4.16 [6] Refractive index n D [8] at 20 °C 1.518 1.473 1.531 1.650 1.459 1.608 1.7 Dispersion at 20 °C, 10 4 ×(n F - n C) [8] 86.7 72.3 89.5 169 67.8 ...