Replying to excerpts from previous posts:

> If you use one pipe on, say, the Diapason stop to tune another one,
> like an Aeolian, they will slightly pull together as you get near the
> correct tuning!

> Yes, organ pipes will pull towards each other, ...

I am curious to know, how do you know this?  Can you hear it by ear
or only by a tuning machine?  Or is this for pipes in close proximity
(less than an inch apart with their speaking sides facing each other)?

Richard Moody