Hermann Ludwig Ferdinand Von HelmholtzLongmans, Green & Company, 1899 - 299 pages |
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Page 62
... waves , the smaller ones corresponding to the individual beats of the heart , and the larger to the respiratory move- ments . The myograph of Helmholtz , already re- ferred to ( p . 36 ) , recorded the shortening of the muscle with ...
... waves , the smaller ones corresponding to the individual beats of the heart , and the larger to the respiratory move- ments . The myograph of Helmholtz , already re- ferred to ( p . 36 ) , recorded the shortening of the muscle with ...
Page 114
... wave . Large waves give rise to a sensa- tion of bright light , small waves to a sensation of dim light . Again , the sensation of colour depends on the rapidity with which the waves follow one another , or , in other words , on the ...
... wave . Large waves give rise to a sensa- tion of bright light , small waves to a sensation of dim light . Again , the sensation of colour depends on the rapidity with which the waves follow one another , or , in other words , on the ...
Page 115
John Gray McKendrick. to a series of waves differing in rate of succession from the others . Thus the waves that give rise to a sensa- tion of red light follow each other at the rate of about 435 millions of millions per second , while ...
John Gray McKendrick. to a series of waves differing in rate of succession from the others . Thus the waves that give rise to a sensa- tion of red light follow each other at the rate of about 435 millions of millions per second , while ...
Page 116
... wave - lengths affect one part of the retina at the same time , they are fused together , and we have the sensa- tion of a third colour different from its cause . if red be removed from the solar spectrum , all the others combined will ...
... wave - lengths affect one part of the retina at the same time , they are fused together , and we have the sensa- tion of a third colour different from its cause . if red be removed from the solar spectrum , all the others combined will ...
Page 117
... wave - length on the retina , and are therefore simple , any other colour may be matched by a mixture of 1 An interesting account of Clerk Maxwell's work on the subject is given by Glazebrook in his Life of Maxwell . London , 1896 , p ...
... wave - length on the retina , and are therefore simple , any other colour may be matched by a mixture of 1 An interesting account of Clerk Maxwell's work on the subject is given by Glazebrook in his Life of Maxwell . London , 1896 , p ...
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Common terms and phrases
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.