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Frank:

Slide rules have long fascinated me, though back prior to retirement, when employed as a draftsman-designer, we used Smokey's Tables. This was in pre calculator days, the couple of places obtainable with a slide rule weren't sufficient for the calculations pipe fabrication required. One could run a quick check with a slide rule, and if the answer was out in left field somewhere, another look was indicated.

in any case, I have a small collection of slide rules,  both stick and circular, the last seemingly never really popular, who knows why. Your occasional comments remain interesting.

Alan

and circular