One of ours says both. Rr 138 8/9, and Kh 7.2
Well, now I've been out and looked at a few, and they don't say 138 8/9. They say 13 8/9. And there are quite a few out there with the
same 7.2 Kh, but a different Rr (27 1/3, or something like that).
So Rr is not the reciprocal of Kh, nor does it have any apparent mathematical ratio thereto. I have no idea what it means.
Funny thing, though. If it did say 138 8/9, that would make sense!
