This is probably one of the greatest "how it works" films ever. On July 2, 1978, the New York Times printed its last edition using its old -- hot-type, lead-casting -- Linotype machines, and switched to the new computer-based systems. As they did this final run, they filmed the whole process, talked with people working on the systems, and showed all the details of how the printing process worked; and then a few months later, they did the same with the new system, to show how they stack up against one another.
The result is by turns fascinating and touching, as people who have worked these machines for decades say farewell to their clanking, mechanical friends.
(I came up in newspapers during the very end of that early digital era, where we would typeset electronically and layout partially by hand, and end up with "camera-ready art" for those electronic Linos which could produce presses. By the time I was in charge of laying out my own paper, the whole layout process was done on computers, and it felt like magic. "Cut" and "Paste" are so much easier when they don't literally involve cutting and pasting. But this will always leave me with a warm feeling for these old machines, and a slight sadness that I never had a chance to work in lead)
h/t +Woozle Hypertwin
for the link.