Mike,
The nearest I can get on "taps" and "triddles" is in D'Acres Art of Water
Drawing 1659, take your pick:
Tawmps - "stops of wood or iron standing forth of the moving axletrees".
Trundle - same as a "rundle" in translations of De Re Metallica by Agricola,
ie two discs with a series of rods between to engage a toothed wheel at
right angles and thereby drive a shaft, usually, at right angles.
Treddle - same as modern term for a foot pedal. He says that for water
drawing: "they cannot in this way perform any great or worthy service by
reason that their feet will not permit so long a streak (stroke) as their
hands".
Early smeltmill standing to full height - probably the Marrick High Mill
qualifies as C17/18th and possibly also the Low Mill. Tyson's monograph Brit
Min. 38 does not establish the dates of building and rebuilding but there were
mills on the site before the Cupola Mill of 1701 - but then you knew that.
It's the best preserved/oldest of which I know.
Another one might be Easby/Brocken Brae, near Richmond - now part of a house.
Also Angarrack, Cornwall (J. Higgans J. Trev. Soc. No.7, pp37-55, 1979-80) has
1706 on door lintel and was said to be still in use as a commercial or domestic
building.
Also the roasting house at Ilsington, Devon (not stictly smelting) but used as a
barn in 1977 (PHG Richardson - Plymouth Mineral & Mining Club J., No.3, 16-17,
1977, may be still standing.
Richard
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