Hermann Ludwig Ferdinand Von HelmholtzLongmans, Green & Company, 1899 - 299 pages |
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action æsthetics animal appeared Berlin blue body Bois Reymond brain Brücke cause chemical Clerk Maxwell cochlea colour combinational tones compound conception conservation of energy contraction distance dynamics electrical empiristic ether experiment explain fermentation fibres fluid force galvanometer geometry give green heat Hermann von Helmholtz Hertz holtz horopter important invention investigation Jefferson Medical College Johannes Müller kinetic energy Königsberg lecture Leibnitz lens light Lord Kelvin luminous magnetic mathematical matter mechanical Medical membrane ment method mind motion movements muscle muscular musical nature nerve nervous impulse object observed ophthalmoscope optics paper particles pass phenomena physical physicists physiological pitch plates ponderable pressure principle problems produced Professor pupil quantity rays recognised resonance retina rotation scientific sensation showed sound stapes stimulated surface theory Thomas Young tion tones velocity vibrations violet vortex vortex rings waves yellow
Popular passages
Page 203 - That gravity should be innate, inherent and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of any thing else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking, can ever fall into it.
Page 46 - Heat is a motion, expansive, restrained, and acting in its strife upon the smaller particles of bodies. But the expansion is thus modified: while it expands all ways, it has at the same time an inclination upwards. And the struggle in the particles is modified also; it is not sluggish, but hurried and with violence.
Page 238 - Every body continues in a state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.