Don Tuite wrote:
Seen this?

http://www.antiquark.com/sliderule/s...l-n909-es.html

Boy does that bring back memories!

BTW, I still use my pocket-size plastic circular slide rule on occasion
because the back of it has the periodic table of the elements and the
plastic insert has a whole bunch of conversion constants for length, area,
mass, force, volume, velocity, flow rate, pressure, energy, and a bunch of
common physical constants and common equations.