measurements at the highest pressures. If the data arefitted using these points, the S obtained are about threetimes larger and the highest graphite volume fractionpoints obviously give the largest x2 values. Upon examination the large contributions to x2 were found to occurwhere the pressure on the sample exceeded 50 MPa.This is thought to mark the onset of compaction bycrushing as well as slippage and so no data where thepressure exceeded 50 MPa were included in the analysis.This also eliminates serious pressure effects on the conductivity of the graphite itself. This shows that, notsurprisingly, a single pair of morphology parameterscan only be obtained for a particular type of compactionor agglomoration process.The difference between these results and the twolinear region ones of Marinkovic et a1 (1971) is primarilydue to the method by which the samples are preparedand their geometries. The present experiment starts in