, that are newly developed and whose applications have not been fully explored on the other brasses (Greenhoe).
             Figure 5. The Périnet (improved) piston valve. Figure 6. The Piston valve horn (rare)
             Figure 7. The Rotary valve. Figure 8. The Rotary valve horn.
             Figure 9. The Vienna valve. Figure 10. The Vienna valve horn.
             The Périnet valve (or improved piston) was developed in 1838 by François Périnet as an improvement on the Stölzel piston. The valve has a lighter and faster motion than the Stölzel, as well as a better tubing configuration. The improved piston consists of a piston that slides a
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