I have been listing to an audio book of The Hound of the Baskervilles. In it there is a line which says “…with her fingers over the typewriter stops…”. I am assuming this is referring to the keys of the typewriter, and I’m guessing this is purely antiquated usage.
But I was wondering why they are called “stops”. I have only heard of stops in similar usage when talking about musical organs; where the stops are used to select different effects (I am in not musical, so I am sorry for my poor description). But an organ also has keys, which you press to play the actual note (and pedals which, I have been lead to believe, are also for notes or cords). Stops are also used in a put-in-a-setting-and-leave (or latching), while the keys are a temporary, which would make them more like the keys of a typewriter.
So why are stops used to refer to a typewriter’s keys? They are closer to the use of keys rather than stops of a musical organ.