| 单词 | working arch | 
| 释义 | > as lemmasworking arch   working arch  n. now historical an arch of masonry at the mouth of a blast furnace; cf. tymp arch at tymp n. 1b. ΘΚΠ society > occupation and work > equipment > furnace or kiln > furnace > parts of furnace > 			[noun]		 > openings for metal or crucible tympa1650 working arch1824 tap-hole1825 working door1839 tapping-hole1861 slag notch1882 1824    Encycl. Brit. Suppl. V. 125/1  				The fold, fauld, or working-arch, by which the hearth is approached. 1881    Trans. Amer. Inst. Mining Engineers 1880–1 9 132  				Fauld, the tymp-arch or working-arch of a furnace. 2009    APT Bull. 40 51/2  				A working arch at the base, in one of several shapes, gave access to the stone hearth. < as lemmas  | 
	
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