from The Century Dictionary and Cyclopedia
- n. In metallurgy: A vertical slot cut through the dam and dam-plate of a blast-furnace.
- n. In the puddling-furnace, a small hole through which the slag, technically termed tap-cinder, is let out, and which during the process of puddling is stopped with sand. See diagram under puddling-furnace.
- n. In a cementation-furnace, a small hole in one end of each pot, opposite to which is a hole in the furnace-wall, used for the insertion of “trial” or “tap” bars, so placed as to be accessible for ready withdrawal and inspection during the cementation process. Also called testing-hole.
- n. In general, any small hole in a furnace through which metal or slag, or both, are drawn at any stage in the process. Also tapping-hole.
Sorry, no etymologies found.