Hey Lary, I don't remember an optacon with a vibration thingie on the chest, but such a thing was done here at Smith-Kettlewell using a TV. camera and an array of vibrating pins. Had you really been desperate enough it's possible you could have used it on scope, but they were hideously expensive to build and unreliable as all heck
Actually we have a design for an audible scope which I think might work on engine analysis devices, although i don't know what the scope pattern looks like to be sure. It doesn't work with multi-trace patterns, but with simple single trace stuff it works fine. On the level, no, i was just thinking of a single pager motor turning on and off, one side of level, it'd be on all the time, other side of level, it'd be pulsing on and off, so level is where it just starts to pulse. Tom
