Modern Mechanix blogs a robotic message display for person-to-person notes in public from the 1930s. Write a note, pay a small fee and the message moves up behind the window to be on display for 2 hours. I love the name, “the notificator”.

My questions:

Did people use it for notifications or for other purposes? (example: “I saw you”’s of the 1930s)

Why are they not around anymore and what does it say for current research on channels for leaving content, messages in public places?

What were people paying for? A portion of public space? Protection for their notes (they are behind glass)?

Was two hours long enough?