On account of the difficultly of producing a whole tone trill on the cornet it is often played in an irregular and clumsy manner. It was in order to overcome this difficulty that these exercises were written.
Mechanical imperfections are frequently found in the construction of cornets, but by slow and careful practice these defects can be remedied and the intervals made to sound clearly in the different registers. These irregularities are often found in the interval from B(natural) to C#, in Ex. 71; also C to D in Ex. 72.
The fingers as well as the lips must be elastic.
Single and double tongue the exercises after you have made sufficient progress in slurring them perfectly.
Try to play Etude IV in one breath. It is possible.
These exercises were written to overcome the difficulty of producing the whole tone trill on the cornet.
With slow and careful practice, the mechanical imperfections found in some instruments can be surmounted.
The most troublesome intervals are B(natural)-C# (Ex. 71) and C-D (Ex. 72).
The fingers and lips should remain flexible throughout this study. When you have mastered these exercises as written, single and then double tongue them.
Practice Etude IV until you can play it in one breath.