I don't have a photo of it, does one even exist?  However, I think I can 
explain 
the concept after reading the archive.  Each valve slide has an input and an 
output valve, thus making for valves.  I am presuming that the other two valves 
are for a stopping or "C: valve. Think of each valve as one half of a Vienna 
valve, where instead of two pistons each valve key has two rotors. 

It truly would be something to see.
Paxmaha





________________________________
From: "[email protected]" <[email protected]>
To: [email protected]
Sent: Tue, July 6, 2010 5:07:54 PM
Subject: [Hornlist] McCracken 8 Valve Single Bb

I was randomly looking up horns and I came across a Hornplayer.net archive 
mentioning the bi-valve McCracken single Bb.

I'm trying to work out in my brain how this is done, but I can't figure it out. 
Does anyone have any photos of this thing?

-William





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