Wels"bach, a.
Definition: Of or pertaining to Auer von Welsbach or the incandescent gas burner invented by him. -- Welsbach burner, a burner in which the combustion of a mixture of air and gas or vapor is employed to heat to incandescence a mantle composed of thoria and ceria. The mantle is made by soaking a "stocking" in a solution of nitrates of thorium and cerium (approx. 99 : 1), drying, and, for use, igniting to burn the thread and convert the nitrates into oxides, which remain as a fragile ash. The light far exceeds that obtained from the same amount of gas with the ordinary fishtail burner, but has a slight greenish hue.
Source: Webster’s Unabridged Dictionary 1913 Edition
18 December 2024
(noun) (linguistics) the form of a word after all affixes are removed; “thematic vowels are part of the stem”
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