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  2. Deadbolt - Wikipedia

    en.wikipedia.org/wiki/Deadbolt

    Deadbolt. A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. [1] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle. The more common spring bolt lock uses a spring to hold the bolt in place ...

  3. French horn - Wikipedia

    en.wikipedia.org/wiki/French_horn

    The French horn (since the 1930s known simply as the horn in professional music circles) is a brass instrument made of tubing wrapped into a coil with a flared bell. The double horn in F/B ♭ (technically a variety of German horn) is the horn most often used by players in professional orchestras and bands, although the descant and triple horn have become increasingly popular.

  4. Vienna horn - Wikipedia

    en.wikipedia.org/wiki/Vienna_horn

    Description. The Vienna horn uses a unique form of double-cylinder valve associated with the Viennese firm Uhlmann of the 1840s known as a pumpenvalve. A pumpenvalve is similar to the standard piston valve, but it is not pushed directly inward. Instead, long push-rods reach across to each lever key (as with rotary valves), allowing either a ...

  5. Brass instrument - Wikipedia

    en.wikipedia.org/wiki/Brass_instrument

    Brass instruments are one of the major classical instrument families and are played across a range of musical ensembles. Orchestras include a varying number of brass instruments depending on music style and era, typically: two to three trumpets. two to four French horns. two tenor trombones. one bass trombone.

  6. Water key - Wikipedia

    en.wikipedia.org/wiki/Water_key

    Water keys on a trumpet. A water key is a valve or tap used to allow the drainage of accumulated fluid from wind instruments. It is otherwise known as a water valve or spit valve. They are most often located at a low bend, where gravity assists fluid collection. In valved instruments such as trumpets, cornets and flugelhorns they are placed ...

  7. Brass instrument valve - Wikipedia

    en.wikipedia.org/wiki/Brass_instrument_valve

    The first of these types was the Stölzel valve, bearing the name of its inventor Heinrich Stölzel, who first applied these valves to the French horn in 1814. Until that point, there had been no successful valve design, and horn players had to stop off the bell of the instrument, greatly compromising tone quality to achieve a partial chromatic scale.

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