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Of or pertaining to Cornwall, in England. Cornish chough. See Chough. -- Cornish engine, a single-acting pumping engine, used in mines, in Cornwall and elsewhere, and for water works. A heavy pump rod or plunger, raised by the steam, forces up the water by its weight, in descending.

with a long, slender, curved bill and red legs; -- also called chauk, chauk-daw, chocard, Cornish chough, red-legged crow. The name is also applied to several allied birds, as the Alpine chough. Cornish chough (Her.), a bird represented black, with red feet, and beak; -- called also aylet and sea swallow.…

The mineral black tourmaline or schorl; -- so called by the Cornish miners. Raymond.

A division of hand. [Obs.] Thirty acres make a farthing land; nine farthings a Cornish acre; and four Cornish acres a knight's fee. R. Carew.

The Cornish name for a forge used for smelting tin. Raymond

Fluor spar; -- so called by Cornish miners.

The Cornish chough. See under Chough. [Prov. Eng. & Scot.]

Iron pyrites, or arsenical pyrites; -- so called by the Cornish miners.

-- Plug rod (Steam Eng.) , a rod attached to the beam for working the valves, as in the Cornish engine. -- Plug valve (Mech.), a tapering valve, which turns in a case like the plug of a faucet.

See Cornish chough, under Chough.

he principal agent used in separating the ore from the sand and gravel. -- Stream works (Cornish Mining), a place where an alluvial deposit of tin ore is worked. Ure. -- To float with the stream, figuratively, to drift with the current of opinion, custom, etc., so as not to oppose or check it.

A rod carrying a tappet or tappets, as one for closing the valves in a Cornish pumping engine.