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.
Originally, all steelmaking furnaces had a tapping spout closed with refractory that washed out when the furnace was tilted, but often modern furnaces have an eccentric bottom tap-hole EBT to reduce inclusion of nitrogen and slag in the liquid steel.
'I am not sure that I can do it, 'said the man,' for I have to go to a wedding with this cask of mead which I have been to fetch, and the tap has fallen out on the way, so now I have to keep my finger in the tap-hole as I drive. '
So the man said that if he would do that he would go, but he begged the Governor to be very careful to put his finger into the tap-hole the moment he took his out.
But time passed, and it grew later and later, and still the man did not come back, and at last the Governor grew so weary of keeping his finger in the tap-hole that he took it out.
This is a 'old cask, and the wood's rotted away about the tap-hole.
Had it been allowed to continue running, until it stopped of itself -- in other words, had the surface of the water sunk to the level of the tap-hole -- then would there have been but little left, scarce enough to have lasted me for a week.
In my search for the bung I had not forgotten the vent or tap-hole.
I understood enough of hydraulics to know that water will rise to its own level if guided by a pipe or tube; I knew, therefore, that if I had only possessed a piece of hose, I could have attached it to the tap-hole, and thus discovered how high the water stood in the cask.
After it is scummed once or twice, you may put in your herbs, and spice grosly beaten, one half loose; the other in a bag, which afterwards may be fastned with a string to the tap-hole, as Pepper, Cloves,
Siemens also supplied casthouse equipment including all hydraulic tap-hole drills and clay guns.
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