Kishkumen wrote:So, you cut off a small piece of papyrus and put it on a metal plate. Then you use the ECD. Does that work?
I get the point about a repeatable measurement, but I have to hand it to Will for coming up with a creative way to get results.
ETA: I see DrW already edited his post to include this possibility.
Hello Kish,
For clarification, the possibility of placing papyrus on a conductive metal plate to make a ECD measurement was included in my original post of Nov 13 as an ETA just after midnight EST.
In any case, if one were allowed to cut off a piece of the papyrus for making an ECD measurement, as you seem to be suggesting, one could certainly use a micrometer on said scrap of paper.
Assuming the papyri were in the condition described in Ben's post above (glued onto a backing and preserved in a mylar cover) then the use of an ECD might become a bit more reasonable.
Aluminized Mylar has a extremely thin, vapor deposited, aluminum coating that might well serve as the conducting surface needed for ECD. However, if the specimens were in a mylar sheath or cover, it is unclear how one would sort out what electromagnetic effects were due to the polymer on which the aluminum was coated, what was due to the backing, and what was due to papyrus.
As Gadianton correctly pointed out, any application of a standard ECD to this kind of measurement, on this kind of layered dielectric / conducting material would require a great deal of calibration.
Again, I could find no published standard method for this kind of application. If anyone here knows of such a published method, I would appreciate the reference.