Hal Clement was one of the best hard SF authors, but he didn't write a whole lot. If "Mission of Gravity" ever gets made into a movie, I want to see digital slide rules made for it.
Take some magnetic linear scales as are used on some milling machines (they are extremely precise and can be cut to length) and arrange them together just like the slides on an old slipstick. Program a microcontroller to do the calculating and operate a display and it could be a real thing even more accurate than the old wood or plastic ones.