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Rachitic rosary on chest radiograph The prominent knobs of bone at the costochondral joints of rickets patients are known as a rachitic rosary or beading of the ribs . The knobs create the appearance of large beads under the skin of the rib cage , hence the name by analogy with the beads of a Catholic Christian rosary .
The bubble at the center of the gather stretches with the cane and forms the hole in the bead, i.e. the bead's perforation. The diameter of the cane, and therefore of the resulting beads, is determined by the amount of glass in the original gather and also by how thinly the glass is drawn out.
Two principal techniques are used to produce seed beads: the wound method and the drawn method. The wound method is the more-traditional technique, is more time-consuming, and is no longer used in modern bead production: in this technique, a chunk of glass known in glassmaking as a gather and composed mainly of silica is heated on an iron bar until molten.
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. Beads range in size from under 1 millimeter (0.039 in) to over 1 centimeter (0.39 in) in diameter.
A hole was drilled before the bead was decorated as drilling caused most breakage during the production process, and holes were also useful for stringing and dipping numerous beads as a step in coloration. The earliest holes were conical and done with solid drill bits drilling from both ends and, hopefully, meeting near the center of the bead.
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 significant in archaeology because the presence ...