We used to have a Linotype caster that set line of hot metal at my school printing club, along with a Heidelberg letterpress printing machine. It was many enjoyable hours spent there that first got me interested in printing as a career (and also helped me fail my A-levels).
Of course you would never be allowed to have school children working that sort of machinery now in case they got injured. But back in the 70's we were often unsupervised, and nobody got hurt.
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