Holton Sousaphone With Buescher Short Action Valves
Posted: Sat Apr 23, 2011 10:39 am
This is in regard to the Holton-Buescher sousaphone with short-action valves (currently on eBay, item #330555945223).
The seller reports to me that the valve stroke is 15 mm. (He did not report measurement error.) Thus, the Buescher design is comparable to Conn short-action valve design, which are typically 15-16-17 mm after valve alignment.
The seller misreported the patent number. The actual patent number is 1,601,555.
The patent is available online at http://www.google.com/patents/about?id= ... dq=1601555" target="_blank" target="_blank. The patent drawings make it easy to understand the design. As you can see, the patent date is indeed Sep 28, 1926, as also marked on the horn.
I suspect this is a Holton-built instrument using the Buescher valve design. (Just my guess, mind you!)
Both the Buescher and Conn designs rely on constancy of cross-sectional area of the tubing through the valve cluster.
I am awaiting seller response regarding the weight of the instrument.
For this and other interesting patents, see http://www.horn-u-copia.net/patents.php" target="_blank" target="_blank.
Paul R. Ogushwitz, Ph.D.
The seller reports to me that the valve stroke is 15 mm. (He did not report measurement error.) Thus, the Buescher design is comparable to Conn short-action valve design, which are typically 15-16-17 mm after valve alignment.
The seller misreported the patent number. The actual patent number is 1,601,555.
The patent is available online at http://www.google.com/patents/about?id= ... dq=1601555" target="_blank" target="_blank. The patent drawings make it easy to understand the design. As you can see, the patent date is indeed Sep 28, 1926, as also marked on the horn.
I suspect this is a Holton-built instrument using the Buescher valve design. (Just my guess, mind you!)
Both the Buescher and Conn designs rely on constancy of cross-sectional area of the tubing through the valve cluster.
I am awaiting seller response regarding the weight of the instrument.
For this and other interesting patents, see http://www.horn-u-copia.net/patents.php" target="_blank" target="_blank.
Paul R. Ogushwitz, Ph.D.