Hello,  I was wondering if someone could point me in the direction of a
diagram of a reiterating valve. I am most interested in the type used
in street organs where a drum for example may be repetitively fired to
cause a drum roll.

Thanking you in advance,
John Hutchison

 [ John told me later that he enjoys experimenting while building
 [ automata, "mainly singing birds as wall sculptures," and he wants
 [ to mimic the fast repetitive sounds that some birds make.  Since
 [ efficiency is not a problem with this sort of automaton, other
 [ devices that modulate air flow might be used, for example, the
 [ rotary interrupter of a siren, or a knife valve modulator of a
 [ small pipe organ tremulant.  -- Robbie