It was thus said that the Great Tony Duell once stated:
I find I can't use anything but an RPN calculator now. It's just so much
simpler once you've learnt it. That's why I have a few dozen HPs (LED and
LCD models).
I recently came across a good site that describes how to use one:
http://dspace.dial.pipex.com/town/square/gd86/slides.htm
and I've been having fun using the one slide ruler I have, getting a feel
for how to use it.
-spc (it's neat how they work ... )