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#61
A slipstick is a slang term for sliderule. A slide rule was an expensive analog calculator that requires a certain amount of skill to use and wasn't as accurate and couldn't do as many functions as the cheapest scientific calculators of today. The free calculator in Windows is easier to use and is far more accurate than a slipstick ever could be yet slipsticks once were used to engineer almost every thing from automobiles to planes and big ships, homes to giant skyscrapers, and even put people in space.
I still have my Daddy's old sliderule somewhere. I fooled with it some when I was a kid but Daddy worked for Motorola and was able to score an early pocket calculator so guess which one I used most of the time?