...He is accessing all of them to find red-gray chips that are a match for the chips a-d in the Bentham paper of Harrit et al. The chain of custody is carefully documented for each, and the chain of custody for each sample he uses will be explained in detail in his report.
Hey Chris,
I am sure Jim will do what I am about to suggest without needing anyone to tell him, but I in order for readers to interprete the data from different tests done on individual chips, it is totally necessary to first identify and name individual chip specimens, indicate which dust sampe they are taken from, and, when presenting data, indicate which data point, graph, image etc. is taken of which named specimen.
This is something that Harrit e.al. did not (and a major reason why their crap paper should never have passed a serious peer review). Last week I spent a serious number of hours rewriting my woefully incomplete draft of the paper that Ivan alluded to a few posts up, and my main problem was deciding which data to include in my new interpretation and which to exclude. You see, I want to use only good data that I can assign with sufficient certainty to chips (a)-(d), at the same time I am aware that I might get criticized for "hand-waving" data that could also belong to these chips, even though I feel we can't be sure enough. For example, for the longest time we have assumed that the DSC data on four chips presented in Fig. 19, that resulted in energy density values of 1.5, 3, 6 and 7.5 kJ/g, came from chips (a)-(d), simply because these are four chips, too. It only dawned at me recently that these four DSCed chips cannot be identical to the four chips (a)-(d) presented in Fig. 6 and 7, very likely also in Fig. 2, 8, 9, 10, and fairly likely Fig. 11. Reason: Chips (a)-(d) come from dust samples a-4, while two of the DSC chips came from sample 1 (MacKinlay) and none from sample 2 (Delessio). Also, after reviewing the Jeff Farrer interview, it seems that they had done the microscopy and XEDS tests on (a)-(d) in Farrer's lab at BYU, and at a later time looked for and found a DSC at another lab, outside of Farrer's area of responsibility (and expertise). There is no reason to believe that any of the four chips (a)-(d) made it to that DSC lab and Figure 19. On the other hand, we have exactly
no data on the four DSC chips except the DSC traces and energy densities: No image, no XEDS trace, no description, nothing. So it would be irresponsible to lump these four chips into a discussion of chips (a)-(d).
On the other hand, I am only
guessing that the four chips photographes in Fig. 2 and labelled (a)-(d) are identical to the chips BSE-imaged and labelled (a)-(d) in Fig 5, and I am only
guessing that the chips XEDS'ed and labelled (a)-(d) in Figures 6 and 7 are identical to the chips (a)-(d) in Fig. 2 and/or Fig. 5. And again, there are four higher resolution BSE images of chips labelled (a)-(d) in Fig. 8, but the paper doesn't really tell us, and we have to
guess, that these were taken of the identical chips presented in Fig. 2, 5, and/or 6 and 7. The only indication we have that several different data points were gathered from the same specimen involves Figures 8a, 9 and 10, which were all done on an identical chip specimen found in dust sample 1.
The authors do tell us that the four specimen in these figures are all "representative of all the red/gray chips studied from the dust samples" (page 11, referencing Fig 5), but this can't be true - they contradict that claim later in the paper. It is of course obvious that they DID find chips with different characteristics, such as the MEK chip, or the specimen (or residues) shown in Fig. 25 (with significant Ti), 31 (several gray layers with different hues, with significant Pb), 32 (gray layer is mainly C, not Fe), or those mentioned in the text that contained copper and barium, both absent from the XEDS data of chips (a)-(d) and the MEK chip.
In the end, I decide to use the data from Fig. 2 and 5-11, and discard all others. However, I will mention the DCS data (ignition point mainly) and the apparent formation of spheres in the DSC.
In order to avoid this kind of confusion, I hope that Jim will identify and label individual chips, and indicate in each table and figure of data which individual chip is shown there. I'd expect full data on a representative sample size of more than four chips on whom all relevant non-destructive tests are done that Jim is going to do.