Hermann Von Helmholtz |
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Academy acoustics after-images alteration anatomy apparatus appeared Berlin body Bois Bois-Reymond Bonn Brücke colours combination tones conclusions conductor Conservation of Energy Consonance and dissonance cornea corresponding curvature determined discovery distance Donders electrical electromotive force elements equations excitation experimental experiments expressed external fact father fatigue fluid forces friends fundamental gave give given Goethe harmony heat Heidelberg Helmholtz ideas illumination important instruments interesting investigations Johannes Müller Kirchhoff Königsberg later lecture letter light Lord Kelvin Ludwig magnetic magnitude mathematical mechanical ment method motion muscle natural science nerve object observations ophthalmoscope over-tones particles perception phenomena philosophical physical physicists Physiological Optics position possible potential Potsdam prime tone problems produced Professor published question rays refraction regard relations retina rotation scientific Sensations of Tone simple space spectrum surface theorem theory theory of colour Thomson tion tube velocity vibrations vis viva wife writes