5 Mar
2013
5 Mar
'13
4:29 p.m.
On Tue, 5 Mar 2013, Jim Stephens wrote:
I looked for some info online as it has been too long
to remember what
the scale equivalent was on mine, but wikipedia says a 10" had 31cm of
equivalent length.
You do NOT need nor want Wikipedia for that!
Not good to become dependent :-)
Circumference is PI times diameter.
about 80cm
31 INCHES would be close. But, common problem with slide rules is
not getting the decimal point or units correct. :-)
31 inches would be closer to correct than 31.4159, since the diameter
of the scale would be less than the outer diameter of the rule in most cases.
I had a circular rule that consisted of two disks on a common spindle. It
would have been nice it were better made.
--
Grumpy Ol' Fred cisin at xenosoft.com