>Of Joseph B. ReidI simply wanted a single US legal source for the basic non-metric definitions as I can with Canada, Ireland, and UK. It could have 42decimal places for all I care, as long as it is the definitive legal definition
I suggest that you use NIST Special Publication 811, Guide for the Use of the International System of Units (SI).
Thanks. I was not aware that it had so many US non-metric units in there. It will be useful.
However, it clearly cannot be used for a true legal definition because it has rounded off some of the unit values.
NIST 411 states "Factors in boldface are exact". Those in plain type are mostly measured factors subject to experimental error, or are compound units whose exact value can be determined by multiplication or division of the factors of their component parts. For example: 1 foot per hour = 0.000 846 666 666 666... . meters per second.
-- Joseph B. Reid 17 Glebe Road West Toronto M5P 1C8 Telephone 416-486-6071
