I apologize Larry. Though not fact, I was commenting on hints of possible time frames for changing of pressure measuring equipment, not conversion formulas.
I made the CIP comment because apparently the confusing and differing marking choices are in full compliance. In the same book, I noticed that a 'Working Group' of the CIP 'Technical Committee' had 'Calibration of Piezo Electric Transducers' as a task to work on in 2008. It explains that if a standard could be determined, it would not be up for vote by Member States till the next meeting, two years later.
It seems to point out that CIP compliance allows/ed variation in methodology not just marking, significantly later historically than the likely introduction of the electronic transducer. Best of luck with the folks in Birmingham. The '92 to '95 modernization comment I quoted was for the London Proof House.
