The answer is purly subjective and, thus, cannot be found here.
The trombone player.
Trombone are different for everyone so I recommend you go to a band shop and just try out their trombone and see what brand you like best.
A trumpet player will probably be able to make a sound on the trombone, but a lack of skill in using the relatively large mouthpiece on a trombone will result in a low quality sound at best. Plus, playing a valved trumpet will usually not make for an easy experience trying to learn a slide trombone.For a bit of fun, ask a trombone player in your band if you can try his instrument out. Try using your trumpet mouthpiece to see what it's like.
A small Trombone.
12c is standard for new trombone players
Yes he played the piano and the trombone. He was for a time a professional trombone player.
The player's lips vibrate.
at the back. I think
Ravel is not primarily known for making trombones; they are more recognized for their musical compositions and orchestration. If you meant a specific brand or model of trombone associated with Ravel, it would be helpful to clarify. Generally, the quality of a trombone depends on its brand, model, and the player's preferences. If you are considering a specific trombone, it would be best to check reviews and try it out to see if it meets your needs.
William F. Raymond has written: 'The trombone and its player' -- subject(s): Trombone
By moving the "slide"
When playing a Trombone the player can make it slur. By blowing and moving the valves at the same time.