Robuta

https://archive.org/details/onsensationsofto00helmrich/mode/2up On the sensations of tone as a physiological basis for the theory of music : Helmholtz, Hermann... on the sensations of tone https://archive.org/details/onsensationsofto00helmrich?view=theater&ui=embed&wrapper=false On the sensations of tone as a physiological basis for the theory of music : Helmholtz, Hermann... on the sensations of tone