Wiktionary
slide rules
n. (slide rule English)
Usage examples of "slide rules".
To the outsider, the place is just a set of gray buildings with gray people working slide rules and writing out long equations on blackboards.
Malenfant, a gadget fan, pored over wooden locks, clocks and slide rules, all made entirely of wood.
And he got together with a group of other engineers, all serious men with slide rules, and they borrowed money and mortgaged their houses and built a local system and poured the money back in and started building the Trunk.
She would spend her days with the other students: boys with the final generation of slide rules hanging like trophies from their belts.