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www.yamaha.com/en/musical_instrument_guide/trumpet/mechanism/mechanism002.html

The structure of the trumpet enables the note to be lowered by one tone by pressing the first valve, by a semitone by pressing the second valve, and by one and a half tones by pressing the third valve. The first valve lengthens the trumpet's tube by 160 mm, the second by 70 mm, and the third by 270 mm.

ourpastimes.com/how-do-trumpets-work-12146119.html

In essence, pushing down valves makes the trumpet shorter or longer--at least, as far as air flow is concerned. This, of course, describes the basics. As any experienced player can tell you, actually playing a trumpet takes years to learn and perfect!

www.quora.com/How-do-the-physics-of-a-trumpet-work-given-there-are-only-three...

There are already a couple of other good, accurate answers here, but neither of them delve very far into the specifics of playing the trumpet. Instead, the answers focus on physics instead of playing the horn. To understand how a trumpet works, st...

www.answers.com/Q/How_does_a_trumpet_work

A natural trumpet is a trumpet with no valves, and a fanfare trumpet (also known as a Herald Trumpet) is a trumpet that is long. In other words, the tubing is not wound, but straight, so the ...

www.reference.com/hobbies-games/trumpet-produce-sound-7cab30d10d9b52a7

A trumpet makes sound when the musician makes a buzzing sound while blowing air through closed lips and into the mouthpiece. The air causes a standing wave vibration in the air column inside of the trumpet, which travels down the instrument and is then manipulated by the pressing of the keys.

en.wikipedia.org/wiki/Trumpet

Orchestral trumpet players are adept at transposing music at sight, frequently playing music written for the A, B ♭, D, E ♭, E, or F trumpet on the C trumpet or B ♭ trumpet.

www.angelfire.com/band/vhstrumpets/pages/how.html

They bell does not make the trumpet sound like it does but helps sound like it does. Musicians have to go through a cycle before they play to make the sounds that they do. Before playing a passage of music, the musician has to think about how they what it to sound.

gizmodo.com/how-a-trumpet-works-explained-in-one-animated-gif-508881549

Compared to electric gadgetry, something like a trumpet is a pretty simple contraption, but the way it actually works is super clever when you see it in action.