Catholic - Historic Brass Society

UTLEY & KLAUS
127
Figure 41
Trumpet by Georg Saurle, Munich, 1838 (BNM, MU 201), valve slides.
The fixed construction is clear in those instruments with inner moving slides for which
the outer slide-tube receivers of the first valve are shorter than those for the second valve. This
can be seen for example in Figures 4b and 7b. Instruments with inner moving slides in which
the outer slide tube receivers have the same or almost the same length are suspect of
interchangeability and need to be investigated.
On instruments with two moving outer slides it cannot be determined whether the
construction is fixed or interchangeable without pulling out the slides, since the inner slide
tube receivers could be either of the same length, in which case the slides would be
interchangeable, or of different length, thereby indicating fixed construction. An example
of such a situation can be seen in Figure 27; here the fixed construction could be confirmed