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Yemenite silver-work is noted for its intricate use of filigree and fine granulation. [2] [6] Jewellery containing a high silver content was called ṭohōr by local Jews, or muḫlaṣ in Arabic, and referred to jewellery whose silver content ranged from 85 to 92 percent, while the rest was copper.
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.
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.
Wampum beads are typically tubular in shape, often a quarter of an inch long and an eighth of an inch wide. One 17th-century Seneca wampum belt featured beads almost 2.5 inches (65 mm) long. [1] Women artisans traditionally made wampum beads by rounding small pieces of whelk shells, then piercing them with a hole before stringing them.
The diameters of the pores that comprise molecular sieves are similar in size to small molecules. Large molecules cannot enter or be adsorbed, while smaller molecules can. As a mixture of molecules migrates through the stationary bed of porous, semi-solid substance referred to as a sieve (or matrix), the components of the highest molecular ...
Illustration of stepwise bronze casting by the lost-wax method. Lost-wax casting – also called investment casting, precision casting, or cire perdue (French: [siʁ pɛʁdy]; borrowed from French) [1] – is the process by which a duplicate sculpture (often a metal, such as silver, gold, brass, or bronze) is cast from an original sculpture.