gathering ring

gathering ring

[′gath·ə·riŋ ‚riŋ]
(engineering)
A clay ring placed on molten glass to collect impurities and thus permit high-quality glass to be taken from the center.
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With volunteers Elvita (Elvie) Bitong and Susan Tabler steering the enterprise, students, especially from the Greenfields Community School, pitched in with a lot of verve, even quibbling over who gets the green rings and who gets the red rings, each trying to be quicker and more efficient in gathering rings, than his classmate.