The bead of the Selmer is not an added piece, just the edge of the bell rolled back and formed into shape. Selmer were not the only ones to have this bead, my Buffet-Crampon has a similar one.

Regards, Stuart

Lovely horn George, enjoy.

Dr Go, known as the French rim, I wonder why?, the later Selmers, Radial, Deville, 700 series and later all had a conventional roll.

Regards, Stuart.

Among the best tap dancing I have seen, great playing by all, BUT if I had come in cold during any of the long solos I would not have a clue what tune they were playing. All scrambled egg music. ( perhaps I am showing my age).

Regards, Stuart.

Only a year behind George I have similar problems with arthritis developing in my finger joints, I find that having the lightest valve springs commensurate with good action helps, I don't think you can compare finger action with a violinist, their fingers do not have to move far and exert much pressure.

A typical trumpet valve has 1/2" to 5/8" movement and an initial preload of around 100 grams and final pressure down of around 175 grams according to my measurements.

I have a French Besson trumpet made by Courtois, the springs were stainless steel and so strong I found it impossible to play without pain in my hand, going through the spring stock of 2 local repairers yielded nothing that would fit, I ended up modifying a set of Yamaha Flugel springs, now 100 grams depress the valves half way and the instrument is a joy to play.

Playing 2nd trumpet in a 40s style big band and having no trouble with the fast lines.

Regards, Stuart.

@ROWUK said in Structure of the Trumpet by Yamaha:

Did any of you ever notice that a trumpet is twice longer than for instance a soprano saxophone that plays at the same pitch? If we analyse the spectra of the trumpet, we see the fundamental but primarily “hear” the first overtone. With the saxophone or flute, we “hear” primarily the fundamental.

Would this have anything to do with thr phase of the reflected wave, in a trunpet it closes the lips (reed) and in the saxophone it opens the reed, just a thought. Regards, Stuart.

Playing a lot in Church many years ago from the old "Hymns Ancient and Modern" most seemed to be in concert E, 6 sharps for Bb trumpet, the reason I bought a C, after changing to The Australian Hymn Book most had been dropped to Eb, much easier to sight transpose to F. Regards, Stuart.

As a retired electronic engineer with radio communication experience I realized that the trumpet has similar characteristics as a radio frequency transmission line.

Regardless of buzzing or or just blowing air through a trumpet mouthpiece the resultant sound waveform as seen by an audio spectrum analyzer contains a whole mix of frequencies in the audible range. Applying this to the trumpet we have this mix traveling forward through the length at the speed of sound ~ 1200 ft/second. Some of this wave traveling forward will be reflected from the change in impedance of the tube in the region of the bell and will interfere with the forward traveling wave creating a new standing wave the frequency of which will depend on the length of tube and energy level of the reflected wave,

When a peak of the reflected wave reaches the lips coinciding with a trough in the forward wave the lips will close momentarily and then reopen by the air flow, according to Benade this takes around 3 cycles for the standing wave to stabilize.

An easy demonstration is to just blow air into the trumpet with the mouthpiece attached with relaxed lips and open aperture, while keeping the air flowing slowly close the aperture, a point will be reached when the standing wave will develop and the trumpet will sound.

References,

A Textbook of Sound Edwin H. Barton

Fundamentals of Musical Acoustics Arthur H. Benade

Music, Physics and Engineering Harry F Olson

Basic Physics Vol 3 Sound and Light Martin and Connor.

Regards, Stuart.
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Regards, Stuart.

And the notes are still coming out of his horn after he takes it from his face.

Regards, Stuart.

My opinion of the Yamaha article (for what it is worth) is it was written by the Marketing dept with only a hazy idea how the trumpet works. The second sentence "That said it is the mouthpiece that creates the sound", another half truth Further on it explains the playing of the harmonics by "blowing differently". The physics of creation of a sound in a tube has been known for 150 years yet is not understood by a lot of players and teachers and so the myths are promulgated,