K&E manufacture their last slide rule
11th July 1976
Keuffel and Esser (K&E) were the largest manufacturer of slide rules in the US. On 11th July 1976, K&E stopped production of slide rules. The last one off the production line was presented to the Smithsonian Institution.
A slide rule is a mechanical computing device, or analogue computer, that makes complicated calculations much simpler. Slide rules facilitate calculations such as multiplication, division, exponents, roots, logarithms, and trigonometry.
The invention of the computer and the handheld calculator rendered the slide rule obsolete.
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