>German is a confusing language at times. Treibteller here is a cupellation
>dish (from cupellation = Abtreiben). The point is to get a nice porous (=
>absorbent) ceramic material sufficiently poor in silica to be chemically
>refractory against the attack by liquid lead oxide / litharge. In later
>times, bone ash was the material of choice;
Certainly interesting in relation to Trevor's query regarding the site at
Combe Martin. Earlier refining activity in Devon had used 'tan turves' - the
ash from oak bark recovered from the tanning process - as the lining for
cupellation dishes.
Peter
______________________________________________
Peter Claughton, Blaenpant Morfil, Rosebush, Clynderwen,
Pembrokeshire, Wales SA66 7RE.
Tel. 01437 532578; Fax. 01437 532921; Mobile 07831 427599
University of Exeter - School of Historical, Political and Sociological Studies
(Centre for South Western Historical Studies)
E-mail: [log in to unmask]
Co-owner - mining-history e-mail discussion list.
See http://www.jiscmail.ac.uk/files/mining-history/ for details.
Mining History Pages - http://www.exeter.ac.uk/~pfclaugh/mhinf/
_____________________________________________
|