I don't know if anybody else ever saw this series when it was originally shown years and years ago on UK TV. It was a series of TV programs from the late 80s and early 90s about how various machines worked and they'd do various experiments to show you the inner workings.

I found the presenter/writer's site recently and you can download them for free. One of the author's other sites is pretty interesting as well if you're bored one day.