For a veteran as me, it was very interesting to see how to use a slide rule in this game. I have at least two slide rules from my eary days at a technical university, lying around unused. I will study your method.
For those who want to test it, before trying to buy one, there is a java applet simulating a decent slide rule at:
http://www.taswegian.com/TwoHeaded/U...niVirtual.html
Good hunting!