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By the time I entered high school I had mastered the slide rule. Someone had given me an 8 inch K&E. When I was discovered using it in class I was told not to do so because it gave me an unfair advantage over my classmates. My thought at the time was that they could also learn the slide rule and quit wasting time doing math we already knew how to do but such was not to be. I had to accommodate the lowest common denominator.
In our math classroom we had a huge demonstrator slide rule (8 or 10 feet long) hanging on the wall. I don’t know why since none of the teachers knew how to use one and it just hung there. It came in handy on tests because I could read the logarithms off the L scales from across the room, do multiply and divide by adding and subtracting, and converting back. This saved an immense amount of time with calculations.
In college, it was the norm to attach your slide rule in its case to your belt and walk around campus with it dangling. No wonder engineering students had little social life. It was said that when visitors came to campus they were told “Those are engineering students….do not get too close to them.” I believe it was my class year classmates and I who stopped carrying them this way and we did get dates.