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Reply to "Book: Solution of Railroad Problems Using the Slide Rule"

I used a slide rule (Dietzgen) all through high-school and college - indeed it was an early birthday present from my parents when I started 9th grade.

   In college a lot of the engineering and science majors (myself included) would wear the slide rule case strapped to our belt.  It gave the  appearance of "packing" (and, in a sense we were ).  I still have mine and I've never forgotten how to use one although it has been decades since I last used it for anything.

  As for the comment on significant figures - how true and even more so today.  It is quite common to see an analysis performed with data good to just a single significant digit reported out to 3 or even 4 "significant" digits - or as my professors used to say - "empty precision."

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