Assuming that in glass melts the electric current is dominated by mobile ions, here is one possibility to do it. Take a look.
http://glassproperties.com/resistivity/ElectrResistMeasurement.htm
Thanks you very much. It is exactly that I need, and the webpage is so useful.
Good luck, as I understand you must find a ceramic vessel which does not reac at 1350°C and which is insulating.
Can’t one one a method given in file attached herewith[ Fig.1-b]? All one has to do is to plot a graph between specific resistance and temperature and EXTRAPOLATE the curve up to 1350 C to obtain the specific resistance at this temperature. Then convert this specific resistance value into the specific conductance. In addition, the same experiment can give you the viscosity as a function of temperature/conductance.
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