"notbob" wrote in message
...
On 2009-09-09, Leon wrote:

replied with what is half of 5.3mm. YOU gave the answer but tried with
out
success to show me a ruler with that marking.

That's because NO ONE! makes a RULE in that small a graduation, in
either Imperial or Metric. They don't make it cuz no one can use it!!
There are other measuring instruments that can easily make that
measurement in metric. What don't you understand?

nb

I see you now understand my point, the answer to why we still use fractions
of an inch originated by the OP. I have a couple of Bridge City rules that
are in 64 th graduations. Half way between those graduations is 128 ths of
an inch. That measurement is much easier to mark than 2.65 mm. Thanks for
helping me better understand why I perfer fractions of an inch over metric
measurements. Apparently you need much more sufisticated measuring devices
than a rule to measure sizes smaller than 1 mm. 1/64" is easily marked with
a rule.