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One of my favourites is this 1953 explanation of the workings of mechanical analog computers used by the US Navy: https://www.youtube.com/watch?v=s1i-dnAH9Y4

I was going to link this. I think we should seriously consider how the skill to produce such clear and didactic explanations to complex concepts has seemingly degraded nowadays.

Specifically I wonder: who was making these videos? how where they trained? where they attached to the different unit or was it a dedicated group that was commissioned by the different units?

Wow these are really great thanks for sharing. Heres a couple of others that I like.

Differential Steering: https://www.youtube.com/watch?v=yYAw79386WI

Turbo Encabulator: https://www.youtube.com/watch?v=rLDgQg6bq7o

One of my favourite old education films, on the Stirling engine:

Part 1: https://www.youtube.com/watch?v=GqIapDKtvzc

Part 2: https://www.youtube.com/watch?v=GFfMruoRMGo