Slide rule, flight computer

A circular slide rule

A slide rule was a calculating tool.

By 2151, slide rules were considered ancient. In response to Malcolm Reed's request for a sextant, Trip Tucker responded in an equally disparaging manner by saying he left it with his slide rule. (ENT: "Shuttlepod One")

However, such a device was sometimes used on the bridge aboard the USS Enterprise during the 2260s. (TOS: "The Corbomite Maneuver", "Mudd's Women", "The Naked Time", "Who Mourns for Adonais?")

The device used here was specifically a flight computer, typically used in avionics.

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