This is the jammed-up business end of the typewriter in the POTD from three days ago. I think the way the mechanics work is that the circular carriage of arms rotates when you press a letter on the keyboard to line that particular arm up with the paper. That’s a lot of movement between keystrokes. It seems like it would take a lot of effort to rotate the carriage by pressing a key and I can’t imagine being able to type very fast on this machine. Still, I’d probably be faster on it than I am trying to type an email on my smart phone with my thumbs.