Given Douglass' close relationship to/with the Chicago company, I assume  
your cylinder is his - they came with a tan slip if I recall (with the rpm  
marked on it).
 
 Douglass was very interested in methods of increasing  cyl volume, being 
(also) the inventor of the Polyphone.
 
Allen
---------------
 
 
In a message dated 4/21/2012 7:24:00 P.M. Eastern Daylight Time,  
[email protected] writes:

So... Is  the Chicago TTM Jumbo the Douglas creation 
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