Round robin optical measurements of preferred orientation in nearly isotropic pyrocarbon

The results of round robin optical measurements of preferred orientation in pyrocarbon were obtained from seven laboratories (participants). The data were obtained from samples transferred from participant to participant in conventional round robin fashion. Straight lines were fit to this data from each participant pair, and a seven-dimensional hyperline fit was made through the data common to all seven participants. The correlations between participant pairs suggest significantly different degrees of mutual correlation for different participants. The data from some participants are shown to correlate significantly better with the rest of the data than data from other participants. The significance of these results for the high-temperature gas-cooled reactor is discussed