I've used the same system as Grant, preferring "black-glazed earthenware"
unless the item is highly fired stoneware tableware which I term
"Jackfield-type."

I might add a further caveat to this discussion. Some of the Stafforshire
immigrant potters I've studied in nineteenth century Utah made earthenware
teapots and cups which could easily be mistaken for Jackfield or even
Wielden ware.  Making an attribution of place of manufacture based upon
appearance becomes very sketchy by the mid-nineteenth century.

I think George Miller or William Liebeknecht might make a more informed
comment about the terminology used by consumers.  I would speculate that
those marketing the ceramics probably used terms earthenware and stoneware
rather flexibly for black glazed teapots, as the color was more important.

Cheers,
Tim

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Timothy James Scarlett
Assistant Professor of Archaeology
Program in Industrial History and Archaeology
Department of Social Sciences
Michigan Technological University
1400 Townsend Drive
Houghton, Michigan 49931-1295 USA
Tel (906) 487-2113 Fax (906) 487-2468 Internet [log in to unmask]
MTU Website: http://www.industrialarchaeology.net
SHA Website: http://www.sha.org  SIA Website: http://www.sia-web.org
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"No history can show as these things show, that during the war a hundred
thousand hands armed with these sickles were reaping wheat and rye so as to
make any kind of war possible."
     -Henry Chapman Mercer, 1909.