This second entry in the Oscilloscope Triggering Advanced Course focuses on advanced edge-based trigger modes as well as several other modes.

The oscilloscope pattern can also be fed into a computer rather than being filmed, for rapid readout that shows a two-dimensional image for quick identification.

A draftsman for a sign-painting business in Cherokee, Iowa, Laposky began experimenting in 1950 with an oscilloscope, a device that records the activity of electrical circuits in wavelike patterns ...

The patterns, by the way, are special cases of a harmonograph, and if you are more a mechanical hacker than an electronics hacker, we have another suggestion for you.