Position of Mouthpiece on the Lips

Some more excellent techniques for learning the trombone.
The mouthpiece should be placed in the middle of the lips, two thirds on the lower lip and one third on the upper lip. This is believed to be the best position for the trombone player. The lips must never be protruded. On the contrary the corners of the mouth must be drawn down, enabling a freer, more open tone production. When the lips begin to tire the performer should never force the tone. He should then play more softly, because with continued loud playing, the lips swell, and it becomes impossible to emit a note. The performer should stop playing the moment the lips begin to feel weak and fatigued as further playing can be damaging to the lips.

Holding the Trombone and Relaxation

The entire weight of the trombone should be sustained by the left hand. The slide of the trombone should be freely thrown between the thumb and fingers of the right hand, while using the elbow and wrist like hinges to lengthen the reach, and not forgetting that the player must learn to throw the slide to the finger-tips for the seventh position. Players should use no tension in the right hand as relaxation will enable a freer system of shifting when using both elbow and wrist.
These are excellent techniques for learning the trombone.