Hearing the Field 199
Figure 13.2
Wheatstone ’ s “ Harmonic Diagram ” (1824), whose rotating wheel can be pointed to a pitch (here D), so that
when the flap is raised, the correct key signature for D major appears.
barré
(Barré)
#1
Hearing the Field 199
Figure 13.2
Wheatstone ’ s “ Harmonic Diagram ” (1824), whose rotating wheel can be pointed to a pitch (here D), so that
when the flap is raised, the correct key signature for D major appears.