Herbert Clarke Technical Studies

This prepatory exercise is from a series of articles published in "Brass Bulletin" (1980), by James Stamp, called Practical Hints. Here, Stamp show how to practice the "Technical Studies" by Herbert L. Clarke.
Second Study
First choose an easy key in order to familiarise yourself with the simplified musical line.
For example (exercise 37)

Play legato

Then repeat the original line. On the third repeat, play double speed.
By practising like this you will learn to "place" and "centre" your notes correctly, and to improve the fluency, flexibility and intonation of your playing.

O.J. 1996