I'm relatively new to the list so I don't know if there is an archive I should check before listing a slide rule sighting, but: Watching the old U.S. TV show "The Wild Wild West" from 1965, in the episode "Night of the Human Trigger" I saw the deranged villain, a geologist who plotted to take over Wyoming by triggering earthquakes (in about the year 1870), using a small slide rule for his evil machinations. Once in jail he was prescient enough to write e=mc^2 on the walls of his cell. Amazing what a slide rule enables!
Barney