Re: Re: Re: Re: Berlioz Te Deum ... Saxhorn Parts?????


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Posted by Rick Denney on November 06, 2001 at 12:02:49:

In Reply to: Re: Re: Re: Berlioz Te Deum ... Saxhorn Parts????? posted by Erik on November 06, 2001 at 11:13:58:

Think of rotary valves. In one position, one of the curved paths feeds sound from the main bugle coming in to the main bugle going out. When turned 90 degrees, the two curved paths feed sound from the main bugle to the valve tubing, and then from the valve tubing back to the main bugle.

Now, instead of turning the valve, as in a rotary vavle, built it with two sets of curved pathways, one in the straight-through position, and one in the 90-degree position. Then stack those two sets of curved paths on top of each other. If you pushe the valve in and out, you move one set of paths away from the ports and the other set into the ports. That's a Berliner Pumpen valve.

So, it's like a double rotary valve (ala F horn), but feeding only one set of ports like a single rotary valve. It's operating by pushing it in and out like a piston, but it is much more closely related to the rotary valve. It was an easy next step of technology for Cerveny to think of turning the valve rather than pushing it in and out, so that only one set of curved paths could serve both tubing options.

What we call the piston valve was developed by Perinet at a later time.

Rick "thinking a 30-second sketch works a lot better than words" Denney


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