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.

Modern Antiques That Today’s Kids Probably Have Never Used

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.

1951 SLIDE RULE Print Advertisement DIETZGEN by phorgotten

1951 SLIDE RULE Print Advertisement • DIETZGEN Antique Slide Rules • 1950s Retro Advertising • Black & Orange Wall Decor • 50s Science Ad

1951 SLIDE RULE Print Advertisement DIETZGEN by phorgotten

Slide-rule widow - why you should persuade your engineer husband to apply for a job at Boeing!

Slide-rule widow - why you should persuade your engineer husband to apply for a job at Boeing!

"Pickett circular slide rule with two cursors. (4.25 in/10.9 cm width) Reverse has additional scale and one cursor." Caption at link

"Pickett circular slide rule with two cursors. (4.25 in/10.9 cm width) Reverse has additional scale and one cursor." Caption at link

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)

Katherine Johnson, the NASA Mathematician Who Advanced Human Rights with a Slide Rule and Pencil

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)

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