Why don't pipe organs have stops operating by disk-shaped diaphragms like this?

Diagram of disk-shaped diaphragm stop

  • 3
    Why would they? Explaining the motivations of this question would enhance it a lot!
    – Tom
    Aug 26, 2021 at 18:03
  • @JonathanDahlin Could you mention what this diagram is from? (And, for all I know, some organs do have them; do you know that they don't?) Aug 26, 2021 at 18:04
  • 2
    Not making people click through to an external link would help too… all that URL for a simple drawing.
    – Tetsujin
    Aug 26, 2021 at 18:04
  • 1
    @AndyBonner that looks like an air horn of the sort one might find on a boat or a train. I'm sure there's a theater organ somewhere that has some.
    – phoog
    Aug 26, 2021 at 20:50
  • For one thing, unlike an air horn, the air in a pipe organ is compressed, but not at high PSI, so the volume of the air is important. From the looks of it a diaphragm doesn't have much of a cross-section to allow the air through.
    – Duston
    Aug 27, 2021 at 13:45


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