A past societies' imagining of future time travel gear and the specialists who wield the tech.

"In the future, Chrononauts will use powerful technology to transport them to different moments in time. Unlike the massive, clunky time travel contraptions seen in the picture shows or dime store magazines, these wearable devices will read the traveler's very thoughts as they imagine a time and place they wish to visit in the past, present, or even further into the future. These machines may even be capable of multiple functionalities like doubling as mathematic computation machines or notation devices, and of course they will replace your pocket watch as a time keeper."