The lab my wife worked in, 20+ years ago, still had a mahogany chest of "bones" to calculate Fourier transforms, by hand. Once you had phases, you'd plot densit

The lab my wife worked in, 20+ years ago, still had a mahogany chest of "bones" to calculate Fourier transforms, by hand. Once you had phases, you'd plot density on transparent cels, and put them in a stack.