Although this covers machines other than Linotype I thought this was the best place to post it.
An interesting read. If you don't want to read it, you can have it read to you. It is really a layman's overview of the subject some inaccuracies, but what the hell.
https://medium.com/s/letter-rip/hot-metal-transforms-the-speed-of-information-bc54f9bf4e38