5 Mar
2013
5 Mar
'13
4:05 p.m.
On 3/5/2013 3:49 PM, Chuck Guzis wrote:
I'm sure that a few geezers remember the 6 ft. long giant slide rules
hanging just above the blackboard used to teach the use of the thing.
have one available. Post, I think
I recall a "spiral" slide rule in a round
cylindrical package also.
Done to extend the length of the scale but not the physical length of
the rule.
And then there were the circular slide rules. Never used one
I have always used a
circular. The first time I used a 4 or 5" in
school, I decided I needed a better rule, and found an 8" one for sale.
It was enamel on aluminum and very durable. The main reason was just
additional precision.
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. The main thing people didn't like that I recalled
was the dual cursor you had for using the circular ones like that. They
have no moving scales other than the two cursors, and you would set the
two cursors to get the same action as you got by sliding the main slide
on a normal straight rule. It could be fun if you didn't do it right
and nudged the scale when using it.
thanks
Jim