Results for jolly:
- SYNONYMS OR RELATED TERMS: jollying
DEFINITION: A pottery-forming technique that involves use of a rotating mold that leaves its impression on either the interior or exterior surface of the vessel, which is otherwise shaped by wheel-throwing. When the clay body is placed within a concave mold, the process may be called jollying.
- SYNONYMS OR RELATED TERMS: jolley, jollying (n.)
DEFINITION: To form ceramic hollowware by a machine similar to a jigger, but the rotating mold forms the outside while a profile forms the interior
- specific gravity determination
- SYNONYMS OR RELATED TERMS: relative density
DEFINITION: Specific gravity is the ratio of the density of a substance to the density of pure water taken as a standard when both densities are obtained by weighing in air and in prescribed temperature conditions. The measurement of the specific gravity of a metal artifact can be a useful non-destructive method of determining its composition, if it is a two-component alloy and preferably if one of the alloy components is known. The specimen must be weighed in the air and then suspended in a suitable liquid with a known specific gravity; the result is determined by an equation. Since the presence of a third metal in small amounts upsets the accuracy of the technique, the amount of fore-knowledge required is greater than in most of the other methods of determining the chemical composition of objects. Devices used to measure specific gravity are the Jolly balance, the Westphal balance, the pycnometer, and the hydrometer.
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