This was our calculator! Amazingly, you could get really good at making complicated calculations quickly. You just had to keep track of your exponents. They were based on logarithms, so there were lots of options.
Katherine Johnson, the NASA Mathematician Who Advanced Human Rights with a Slide Rule and Pencil NASA chief Charles Bolden recalls the historic trajectory of the “human computer” who played a key role in the Apollo 11 moon landing, and as a female African-American in the 1960s, shattered stereotypes in the process. (Katherine Johnson, photographed at Fort Monroe, in Hampton, Virginia. Photograph by Annie Leibovitz)