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Whilst browsing the other day,
I came on this video of a movement out of a 'Flute Clock'.
It is a very good example of the workings of barrel organs.
At the very bottom, you can see the cranked bellows
pumping air up into the 'reservoir' sitting on top of it.
From here the air will be admitted to the correct pipe,
at the correct time,
by a valve being lifted open,
when a 'pin' or 'bridge' on the rotating barrel
passes under it.
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Normally only one tune is played on one revolution of the barrel.
However, in this case the barrel is 'pinned' on a spiral
to produce a longer playing time.
Just thought you might like to see how they work.
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