Pat Naughtin wrote in USMA 23933
Dear Bill and All,
I have interspersed some remarks.
on 2002-12-12 12.47, Bill Potts at [EMAIL PROTECTED] wrote:
No, it certainly should not be micron, which is not an SI unit.
True, micron is not an SI unit, but it was a metric unit. Search the
www.bipm.fr site for the archaic word 'micron'.
The symbol for micron is �,
True, and this was approved by CGPM in the past (Search the www.bipm.fr site
for the archaic symbol ' � ' - note spaces before and aft).
which is merely a prefix in the vocabulary of
SI,
'merely' is not an appropriate description of an SI prefix - all prefixes
are more important than 'merely'.
in which the micron's replacement, micrometer (or micrometre), is �m.
I'm sorry, but it seems to me that the original unit, micrometre, was
temporarily replaced by 'micron' until about 1960.
The 9th Conf�rence G�n�rale des Poids et Mesures, 1948, approved the
name "micron". The 13th CGPM, 1967-1968 annulled that resolution and
renamed the unit as the "micrometre".
--
Joseph B. Reid
17 Glebe Road West
Toronto M5P 1C8 Telephone 416-486-6071
