Optical engineers routinely work with digital micro positioners. One could be
attached to your tuning slide and wired to your digital tuner. For even better
results, a second contact mic on the principal oboe could be sampled to provide
the pitch standard.
Even more fun is to swap two tuning
The uncalibrated hornist in need of certainty might induce a precision
brass technician to engrave a ruler on the surface of the main tuning
slide. As the slide has two tubes, you could have one cut in inches and
the other in millimeters.
During tacets you can learn how many millimeters there are
Of course, if you use a marker on your slides,,, you'd better be playing a
"Markermatic" (sorry,, I just couldn't help myself...)
One thing about slides that needs to be said from a technician standpoint...
when ever you pull your slides out - push them all the way in before pulling
them back
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