I guess a computer is really more complicated than a Linotype machine, but it’s all inside that black box. It’s like magic: you don’t see any action. With the heavy metal machinery we used to use to make things, you’d see (and hear, and smell, and feel) lots of stuff happening. It is just amazing to get great chunks of metal, working at high temperatures and relatively high speeds, click-clacking and bang-thumping away, and despite their heavy steel structure, creating precise little things regularly, repeatedly, and reliably. Designing a machine with almost ten thousand moving parts is amazing enough: getting it to work every morning at the hands of a wage-earner, and getting it to keep on working for years and years requires dedication and love. No wonder the compositors were the aristocracy of labor.
The Museum of Printing has a series of ten videos about the Linotype machine. These are for the enthusiast — fourteen minutes on lubricating an obsolete machine is not everyone’s choice of pastime — but if you need to know, here is Linotype Legacy. If you just watch one, try the first which shows you what you’d have to do every morning to get the machine ready to go.
See also Linotype.